99579791664 has 100 divisors (see below), whose sum is σ = 297510114880. Its totient is φ = 32122500480.

The previous prime is 99579791653. The next prime is 99579791671. The reversal of 99579791664 is 46619797599.

It is a happy number.

It is a super-2 number, since 2×99579791664² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 99579791592 and 99579791601.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1199119 + ... + 1279470.

Almost surely, 2^99579791664 is an apocalyptic number.

It is an amenable number.

99579791664 is an abundant number, since it is smaller than the sum of its proper divisors (197930323216).

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

99579791664 is a wasteful number, since it uses less digits than its factorization.

99579791664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478640 (or 2478625 counting only the distinct ones).

The product of its digits is 231472080, while the sum is 72.

The spelling of 99579791664 in words is "ninety-nine billion, five hundred seventy-nine million, seven hundred ninety-one thousand, six hundred sixty-four".