99405983656 has 24 divisors (see below), whose sum is σ = 216816623370. Its totient is φ = 42602564256.

The previous prime is 99405983653. The next prime is 99405983657. The reversal of 99405983656 is 65638950499.

It can be written as a sum of positive squares in only one way, i.e., 99004622500 + 401361156 = 314650^2 + 20034^2 .

It is not an unprimeable number, because it can be changed into a prime (99405983653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126792955 + ... + 126793738.

Almost surely, 2^99405983656 is an apocalyptic number.

It is an amenable number.

99405983656 is an abundant number, since it is smaller than the sum of its proper divisors (117410639714).

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

99405983656 is a wasteful number, since it uses less digits than its factorization.

99405983656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253586713 (or 253586702 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 64.

The spelling of 99405983656 in words is "ninety-nine billion, four hundred five million, nine hundred eighty-three thousand, six hundred fifty-six".