168507787009 has 3 divisors (see below), whose sum is σ = 168508197507. Its totient is φ = 168507376512.

The previous prime is 168507787003. The next prime is 168507787051. The reversal of 168507787009 is 900787705861.

The square root of 168507787009 is 410497.

It is a perfect power (a square), and thus also a powerful number.

168507787009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 900787705861 = 31 ⋅29057667931.

It can be written as a sum of positive squares in only one way, i.e., 26927169025 + 141580617984 = 164095^2 + 376272^2 .

It is not a de Polignac number, because 168507787009 - 2¹¹ = 168507784961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168507787003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 205249 + ... + 615745.

It is an arithmetic number, because the mean of its divisors is an integer number (56169399169).

Almost surely, 2^168507787009 is an apocalyptic number.

168507787009 is the 410497-th square number.

168507787009 is the 205249-th centered octagonal number.

It is an amenable number.

168507787009 is a deficient number, since it is larger than the sum of its proper divisors (410498).

168507787009 is an frugal number, since it uses more digits than its factorization.

168507787009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820994 (or 410497 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 58.

The spelling of 168507787009 in words is "one hundred sixty-eight billion, five hundred seven million, seven hundred eighty-seven thousand, nine".