645349425 has 24 divisors (see below), whose sum is σ = 1219404096. Its totient is φ = 295016640.

The previous prime is 645349403. The next prime is 645349457. The reversal of 645349425 is 524943546.

It is not a de Polignac number, because 645349425 - 2⁸ = 645349169 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614094 + ... + 615143.

It is an arithmetic number, because the mean of its divisors is an integer number (50808504).

Almost surely, 2^645349425 is an apocalyptic number.

It is an amenable number.

645349425 is a deficient number, since it is larger than the sum of its proper divisors (574054671).

645349425 is a wasteful number, since it uses less digits than its factorization.

645349425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229257 (or 1229252 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 645349425 is about 25403.7285649174. The cubic root of 645349425 is about 864.1682561440.

The spelling of 645349425 in words is "six hundred forty-five million, three hundred forty-nine thousand, four hundred twenty-five".