99611978972 has 24 divisors (see below), whose sum is σ = 191307070080. Its totient is φ = 45007042160.

The previous prime is 99611978971. The next prime is 99611978981. The reversal of 99611978972 is 27987911699.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99611978971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6770822 + ... + 6785517.

It is an arithmetic number, because the mean of its divisors is an integer number (7971127920).

Almost surely, 2^99611978972 is an apocalyptic number.

It is an amenable number.

99611978972 is a deficient number, since it is larger than the sum of its proper divisors (91695091108).

99611978972 is a wasteful number, since it uses less digits than its factorization.

99611978972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13556521 (or 13556519 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 68.

The spelling of 99611978972 in words is "ninety-nine billion, six hundred eleven million, nine hundred seventy-eight thousand, nine hundred seventy-two".