161705762506 has 8 divisors (see below), whose sum is σ = 242629723044. Its totient is φ = 80829188160.

The previous prime is 161705762473. The next prime is 161705762513. The reversal of 161705762506 is 605267507161.

It is a happy number.

161705762506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161077809025 + 627953481 = 401345^2 + 25059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161705762506² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11838015 + ... + 11851666.

Almost surely, 2^161705762506 is an apocalyptic number.

161705762506 is a deficient number, since it is larger than the sum of its proper divisors (80923960538).

161705762506 is a wasteful number, since it uses less digits than its factorization.

161705762506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23693096.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 161705762506 in words is "one hundred sixty-one billion, seven hundred five million, seven hundred sixty-two thousand, five hundred six".