645512725 has 24 divisors (see below), whose sum is σ = 940377312. Its totient is φ = 433348800.

The previous prime is 645512719. The next prime is 645512731. The reversal of 645512725 is 527215546.

It is an interprime number because it is at equal distance from previous prime (645512719) and next prime (645512731).

It is not a de Polignac number, because 645512725 - 2²¹ = 643415573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86707 + ... + 93856.

It is an arithmetic number, because the mean of its divisors is an integer number (39182388).

Almost surely, 2^645512725 is an apocalyptic number.

645512725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645512725 is a deficient number, since it is larger than the sum of its proper divisors (294864587).

645512725 is a wasteful number, since it uses less digits than its factorization.

645512725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180597 (or 180592 counting only the distinct ones).

The product of its digits is 84000, while the sum is 37.

The square root of 645512725 is about 25406.9424567381. The cubic root of 645512725 is about 864.2411400575.

It can be divided in two parts, 64551 and 2725, that added together give a palindrome (67276).

The spelling of 645512725 in words is "six hundred forty-five million, five hundred twelve thousand, seven hundred twenty-five".