999999898700625 has 135 divisors (see below), whose sum is σ = 1844404071482973. Its totient is φ = 521927576820000.

The previous prime is 999999898700567. The next prime is 999999898700641. The reversal of 999999898700625 is 526007898999999.

The square root of 999999898700625 is 31622775.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78399992058129 + 921599906642496 = 8854377^2 + 30357864^2 .

It is not a de Polignac number, because 999999898700625 - 2¹⁵ = 999999898667857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 111470277390 + ... + 111470286360.

Almost surely, 2^{999999898700625} is an apocalyptic number.

999999898700625 is the 31622775-th square number.

999999898700625 is the 15811388-th centered octagonal number.

It is an amenable number.

999999898700625 is a deficient number, since it is larger than the sum of its proper divisors (844404172782348).

999999898700625 is an frugal number, since it uses more digits than its factorization.

999999898700625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18062 (or 9026 counting only the distinct ones).

The product of its (nonzero) digits is 128566206720, while the sum is 99.

The spelling of 999999898700625 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, eight hundred ninety-eight million, seven hundred thousand, six hundred twenty-five".