664425262025 has 18 divisors (see below), whose sum is σ = 958399542990. Its totient is φ = 455605893120.

The previous prime is 664425262009. The next prime is 664425262069. The reversal of 664425262025 is 520262524466.

It can be written as a sum of positive squares in 3 ways, for example, as 188696409664 + 475728852361 = 434392^2 + 689731^2 .

It is not a de Polignac number, because 664425262025 - 2⁴ = 664425262009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 271192760 + ... + 271195209.

It is an arithmetic number, because the mean of its divisors is an integer number (53244419055).

Almost surely, 2^664425262025 is an apocalyptic number.

It is an amenable number.

664425262025 is a deficient number, since it is larger than the sum of its proper divisors (293974280965).

664425262025 is a wasteful number, since it uses less digits than its factorization.

664425262025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542387993 (or 542387981 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 664425262025 in words is "six hundred sixty-four billion, four hundred twenty-five million, two hundred sixty-two thousand, twenty-five".