645345825 has 24 divisors (see below), whose sum is σ = 1076428128. Its totient is φ = 341134080.

The previous prime is 645345803. The next prime is 645345847. The reversal of 645345825 is 528543546.

It is an interprime number because it is at equal distance from previous prime (645345803) and next prime (645345847).

It is not a de Polignac number, because 645345825 - 2¹⁴ = 645329441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29599 + ... + 46548.

It is an arithmetic number, because the mean of its divisors is an integer number (44851172).

Almost surely, 2^645345825 is an apocalyptic number.

It is an amenable number.

645345825 is a deficient number, since it is larger than the sum of its proper divisors (431082303).

645345825 is a wasteful number, since it uses less digits than its factorization.

645345825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76273 (or 76268 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

The square root of 645345825 is about 25403.6577090780. The cubic root of 645345825 is about 864.1666492566.

The spelling of 645345825 in words is "six hundred forty-five million, three hundred forty-five thousand, eight hundred twenty-five".