78161172587 has 4 divisors (see below), whose sum is σ = 78437360760. Its totient is φ = 77884984416.

The previous prime is 78161172577. The next prime is 78161172589. The reversal of 78161172587 is 78527116187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78161172587 - 2⁴ = 78161172571 is a prime.

It is a super-2 number, since 2×78161172587² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78161172589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138093662 + ... + 138094227.

It is an arithmetic number, because the mean of its divisors is an integer number (19609340190).

Almost surely, 2^78161172587 is an apocalyptic number.

78161172587 is a deficient number, since it is larger than the sum of its proper divisors (276188173).

78161172587 is a wasteful number, since it uses less digits than its factorization.

78161172587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276188172.

The product of its digits is 1317120, while the sum is 53.

The spelling of 78161172587 in words is "seventy-eight billion, one hundred sixty-one million, one hundred seventy-two thousand, five hundred eighty-seven".