77988983538164 has 6 divisors (see below), whose sum is σ = 136480721191794. Its totient is φ = 38994491769080.

The previous prime is 77988983538163. The next prime is 77988983538197. The reversal of 77988983538164 is 46183538988977.

It can be written as a sum of positive squares in only one way, i.e., 74150354323600 + 3838629214564 = 8611060^2 + 1959242^2 .

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9748622942267 + ... + 9748622942274.

It is an arithmetic number, because the mean of its divisors is an integer number (22746786865299).

Almost surely, 2^{77988983538164} is an apocalyptic number.

It is an amenable number.

77988983538164 is a deficient number, since it is larger than the sum of its proper divisors (58491737653630).

77988983538164 is a wasteful number, since it uses less digits than its factorization.

77988983538164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19497245884545 (or 19497245884543 counting only the distinct ones).

The product of its digits is 17557585920, while the sum is 86.

The spelling of 77988983538164 in words is "seventy-seven trillion, nine hundred eighty-eight billion, nine hundred eighty-three million, five hundred thirty-eight thousand, one hundred sixty-four".