99721677896318 has 32 divisors (see below), whose sum is σ = 150525901674720. Its totient is φ = 49547250000000.

The previous prime is 99721677896311. The next prime is 99721677896369. The reversal of 99721677896318 is 81369877612799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99721677896311) 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, 1595490068 + ... + 1595552568.

It is an arithmetic number, because the mean of its divisors is an integer number (4703934427335).

Almost surely, 2^{99721677896318} is an apocalyptic number.

99721677896318 is a deficient number, since it is larger than the sum of its proper divisors (50804223778402).

99721677896318 is a wasteful number, since it uses less digits than its factorization.

99721677896318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69404.

The product of its digits is 3456649728, while the sum is 83.

The spelling of 99721677896318 in words is "ninety-nine trillion, seven hundred twenty-one billion, six hundred seventy-seven million, eight hundred ninety-six thousand, three hundred eighteen".