645504624025 has 12 divisors (see below), whose sum is σ = 806728302592. Its totient is φ = 512337525840.

The previous prime is 645504624019. The next prime is 645504624041. The reversal of 645504624025 is 520426405546.

It is a happy number.

It is not a de Polignac number, because 645504624025 - 2¹¹ = 645504621977 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101651097 + ... + 101657446.

Almost surely, 2^645504624025 is an apocalyptic number.

It is an amenable number.

645504624025 is a deficient number, since it is larger than the sum of its proper divisors (161223678567).

645504624025 is a wasteful number, since it uses less digits than its factorization.

645504624025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203308680 (or 203308675 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 645504624025 in words is "six hundred forty-five billion, five hundred four million, six hundred twenty-four thousand, twenty-five".