645434500625 has 80 divisors (see below), whose sum is σ = 860630010240. Its totient is φ = 482500800000.

The previous prime is 645434500621. The next prime is 645434500631. The reversal of 645434500625 is 526005434546.

It is a happy number.

It is not a de Polignac number, because 645434500625 - 2² = 645434500621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645434500621) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 358374725 + ... + 358376525.

It is an arithmetic number, because the mean of its divisors is an integer number (10757875128).

Almost surely, 2^645434500625 is an apocalyptic number.

It is an amenable number.

645434500625 is a deficient number, since it is larger than the sum of its proper divisors (215195509615).

645434500625 is a wasteful number, since it uses less digits than its factorization.

645434500625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 645434500625 in words is "six hundred forty-five billion, four hundred thirty-four million, five hundred thousand, six hundred twenty-five".