645464025 has 96 divisors (see below), whose sum is σ = 1233671040. Its totient is φ = 330624000.

The previous prime is 645464021. The next prime is 645464047. The reversal of 645464025 is 520464546.

645464025 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 640 + 2 + 5 = 666.

It is not a de Polignac number, because 645464025 - 2² = 645464021 is a prime.

It is a super-3 number, since 3×645464025³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (645464021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2296885 + ... + 2297165.

It is an arithmetic number, because the mean of its divisors is an integer number (12850740).

Almost surely, 2^645464025 is an apocalyptic number.

It is an amenable number.

645464025 is a deficient number, since it is larger than the sum of its proper divisors (588207015).

645464025 is a wasteful number, since it uses less digits than its factorization.

645464025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 645464025 is about 25405.9840391983. The cubic root of 645464025 is about 864.2194056024.

The spelling of 645464025 in words is "six hundred forty-five million, four hundred sixty-four thousand, twenty-five".