99623440656 has 240 divisors, whose sum is σ = 296784004608. Its totient is φ = 31144089600.

The previous prime is 99623440633. The next prime is 99623440661. The reversal of 99623440656 is 65604432699.

99623440656 is a `hidden beast` number, since 9 + 9 + 623 + 4 + 4 + 0 + 6 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28733035 + ... + 28736501.

Almost surely, 2^99623440656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99623440656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148392002304).

99623440656 is an abundant number, since it is smaller than the sum of its proper divisors (197160563952).

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

99623440656 is a wasteful number, since it uses less digits than its factorization.

99623440656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710 (or 3701 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 99623440656 in words is "ninety-nine billion, six hundred twenty-three million, four hundred forty thousand, six hundred fifty-six".