99906521856 has 72 divisors (see below), whose sum is σ = 268250349360. Its totient is φ = 33007435776.

The previous prime is 99906521831. The next prime is 99906521863. The reversal of 99906521856 is 65812560999.

99906521856 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 99906521856.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488821 + ... + 662388.

Almost surely, 2^99906521856 is an apocalyptic number.

99906521856 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

99906521856 is the 199907-th centered pentagonal number.

It is an amenable number.

99906521856 is an abundant number, since it is smaller than the sum of its proper divisors (168343827504).

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

99906521856 is a wasteful number, since it uses less digits than its factorization.

99906521856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151341 (or 1151327 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 60.

The spelling of 99906521856 in words is "ninety-nine billion, nine hundred six million, five hundred twenty-one thousand, eight hundred fifty-six".