645601225 has 12 divisors (see below), whose sum is σ = 811823040. Its totient is φ = 509205200.

The previous prime is 645601189. The next prime is 645601301. The reversal of 645601225 is 522106546.

It is not a de Polignac number, because 645601225 - 2¹³ = 645593033 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 180085 + ... + 183634.

It is an arithmetic number, because the mean of its divisors is an integer number (67651920).

Almost surely, 2^645601225 is an apocalyptic number.

It is an amenable number.

645601225 is a deficient number, since it is larger than the sum of its proper divisors (166221815).

645601225 is a wasteful number, since it uses less digits than its factorization.

645601225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363800 (or 363795 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 645601225 is about 25408.6840469946. The cubic root of 645601225 is about 864.2806341644.

The spelling of 645601225 in words is "six hundred forty-five million, six hundred one thousand, two hundred twenty-five".