99606516025 has 81 divisors (see below), whose sum is σ = 135774251949. Its totient is φ = 72473007360.

The previous prime is 99606516013. The next prime is 99606516043. The reversal of 99606516025 is 52061560699.

The square root of 99606516025 is 315605.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2329896361 + 97276619664 = 48269^2 + 311892^2 .

It is not a de Polignac number, because 99606516025 - 2⁹ = 99606515513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99606516025.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1260841936 + ... + 1260842014.

Almost surely, 2^99606516025 is an apocalyptic number.

99606516025 is the 315605-th square number.

99606516025 is the 157803-rd centered octagonal number.

It is an amenable number.

99606516025 is a deficient number, since it is larger than the sum of its proper divisors (36167735924).

99606516025 is an equidigital number, since it uses as much as digits as its factorization.

99606516025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 49.

Multiplying 99606516025 by its sum of digits (49), we get a square (4880719285225 = 2209235²).

The spelling of 99606516025 in words is "ninety-nine billion, six hundred six million, five hundred sixteen thousand, twenty-five".