99906521855 has 64 divisors (see below), whose sum is σ = 142598016000. Its totient is φ = 65779983360.

The previous prime is 99906521831. The next prime is 99906521863. The reversal of 99906521855 is 55812560999.

It is not a de Polignac number, because 99906521855 - 2¹⁸ = 99906259711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99906521794 and 99906521803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21487571 + ... + 21492219.

It is an arithmetic number, because the mean of its divisors is an integer number (2228094000).

Almost surely, 2^99906521855 is an apocalyptic number.

99906521855 is a deficient number, since it is larger than the sum of its proper divisors (42691494145).

99906521855 is a wasteful number, since it uses less digits than its factorization.

99906521855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4944.

The product of its (nonzero) digits is 8748000, while the sum is 59.

The spelling of 99906521855 in words is "ninety-nine billion, nine hundred six million, five hundred twenty-one thousand, eight hundred fifty-five".