77988983538165 has 16 divisors (see below), whose sum is σ = 142608427041408. Its totient is φ = 35652106760256.

The previous prime is 77988983538163. The next prime is 77988983538197. The reversal of 77988983538165 is 56183538988977.

It is not a de Polignac number, because 77988983538165 - 2¹ = 77988983538163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77988983538163) 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, 371376111982 + ... + 371376112191.

It is an arithmetic number, because the mean of its divisors is an integer number (8913026690088).

Almost surely, 2^{77988983538165} is an apocalyptic number.

It is an amenable number.

77988983538165 is a deficient number, since it is larger than the sum of its proper divisors (64619443503243).

77988983538165 is a wasteful number, since it uses less digits than its factorization.

77988983538165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742752224188.

The product of its digits is 21946982400, while the sum is 87.

The spelling of 77988983538165 in words is "seventy-seven trillion, nine hundred eighty-eight billion, nine hundred eighty-three million, five hundred thirty-eight thousand, one hundred sixty-five".