99999999999976 has 32 divisors (see below), whose sum is σ = 188774785425600. Its totient is φ = 49661152047360.

The previous prime is 99999999999973. The next prime is 100000000000031. The reversal of 99999999999976 is 67999999999999.

It is a super-9 number, since 9×99999999999976⁹ (a number of 127 digits) contains 999999999 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999999999971) 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, 67695700 + ... + 69157123.

It is an arithmetic number, because the mean of its divisors is an integer number (5899212044550).

Almost surely, 2^{99999999999976} is an apocalyptic number.

It is an amenable number.

99999999999976 is a deficient number, since it is larger than the sum of its proper divisors (88774785425624).

99999999999976 is a wasteful number, since it uses less digits than its factorization.

99999999999976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136853449 (or 136853445 counting only the distinct ones).

The product of its digits is 11862040532202, while the sum is 121.

The spelling of 99999999999976 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-six".