645034025 has 6 divisors (see below), whose sum is σ = 799842222. Its totient is φ = 516027200.

The previous prime is 645034007. The next prime is 645034051. The reversal of 645034025 is 520430546.

It can be written as a sum of positive squares in 3 ways, for example, as 13366336 + 631667689 = 3656^2 + 25133^2 .

It is not a de Polignac number, because 645034025 - 2²⁴ = 628256809 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 12900656 + ... + 12900705.

It is an arithmetic number, because the mean of its divisors is an integer number (133307037).

Almost surely, 2^645034025 is an apocalyptic number.

It is an amenable number.

645034025 is a deficient number, since it is larger than the sum of its proper divisors (154808197).

645034025 is a wasteful number, since it uses less digits than its factorization.

645034025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25801371 (or 25801366 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 645034025 is about 25397.5200561000. The cubic root of 645034025 is about 864.0274522777.

The spelling of 645034025 in words is "six hundred forty-five million, thirty-four thousand, twenty-five".