99815528521 has 8 divisors (see below), whose sum is σ = 101768284800. Its totient is φ = 97871471280.

The previous prime is 99815528497. The next prime is 99815528551. The reversal of 99815528521 is 12582551899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99815528521 - 2²⁷ = 99681310793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99815528551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2151585 + ... + 2197486.

It is an arithmetic number, because the mean of its divisors is an integer number (12721035600).

Almost surely, 2^99815528521 is an apocalyptic number.

It is an amenable number.

99815528521 is a deficient number, since it is larger than the sum of its proper divisors (1952756279).

99815528521 is a wasteful number, since it uses less digits than its factorization.

99815528521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349519.

The product of its digits is 2592000, while the sum is 55.

The spelling of 99815528521 in words is "ninety-nine billion, eight hundred fifteen million, five hundred twenty-eight thousand, five hundred twenty-one".