99777102656 has 56 divisors (see below), whose sum is σ = 246851155776. Its totient is φ = 38874193920.

The previous prime is 99777102653. The next prime is 99777102697. The reversal of 99777102656 is 65620177799.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 99777102595 and 99777102604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99777102653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10118561 + ... + 10128416.

Almost surely, 2^99777102656 is an apocalyptic number.

It is an amenable number.

99777102656 is an abundant number, since it is smaller than the sum of its proper divisors (147074053120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99777102656 is a wasteful number, since it uses less digits than its factorization.

99777102656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20247007 (or 20246997 counting only the distinct ones).

The product of its (nonzero) digits is 10001880, while the sum is 59.

The spelling of 99777102656 in words is "ninety-nine billion, seven hundred seventy-seven million, one hundred two thousand, six hundred fifty-six".