90664221025 has 45 divisors (see below), whose sum is σ = 131259904601. Its totient is φ = 62119165920.

The previous prime is 90664221023. The next prime is 90664221031. The reversal of 90664221025 is 52012246609.

The square root of 90664221025 is 301105.

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 23118290209 + 67545930816 = 152047^2 + 259896^2 .

It is not a de Polignac number, because 90664221025 - 2¹ = 90664221023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90664221023) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 73770111 + ... + 73771339.

Almost surely, 2^90664221025 is an apocalyptic number.

90664221025 is the 301105-th square number.

90664221025 is the 150553-rd centered octagonal number.

It is an amenable number.

90664221025 is a deficient number, since it is larger than the sum of its proper divisors (40595683576).

90664221025 is an frugal number, since it uses more digits than its factorization.

90664221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 90664221025 in words is "ninety billion, six hundred sixty-four million, two hundred twenty-one thousand, twenty-five".