78039177161 has 16 divisors (see below), whose sum is σ = 93249843840. Its totient is φ = 64469018880.

The previous prime is 78039177149. The next prime is 78039177163. The reversal of 78039177161 is 16177193087.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78039177161 is a prime.

It is a super-2 number, since 2×78039177161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78039177163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7189781 + ... + 7200626.

It is an arithmetic number, because the mean of its divisors is an integer number (5828115240).

Almost surely, 2^78039177161 is an apocalyptic number.

It is an amenable number.

78039177161 is a deficient number, since it is larger than the sum of its proper divisors (15210666679).

78039177161 is a wasteful number, since it uses less digits than its factorization.

78039177161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14390464.

The product of its (nonzero) digits is 444528, while the sum is 50.

The spelling of 78039177161 in words is "seventy-eight billion, thirty-nine million, one hundred seventy-seven thousand, one hundred sixty-one".