645322440025 has 48 divisors (see below), whose sum is σ = 825988651200. Its totient is φ = 499901276160.

The previous prime is 645322440013. The next prime is 645322440053. The reversal of 645322440025 is 520044223546.

645322440025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645322440025 - 2³¹ = 643174956377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92489337 + ... + 92496313.

It is an arithmetic number, because the mean of its divisors is an integer number (17208096900).

Almost surely, 2^645322440025 is an apocalyptic number.

It is an amenable number.

645322440025 is a deficient number, since it is larger than the sum of its proper divisors (180666211175).

645322440025 is a wasteful number, since it uses less digits than its factorization.

645322440025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978 (or 7973 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

The spelling of 645322440025 in words is "six hundred forty-five billion, three hundred twenty-two million, four hundred forty thousand, twenty-five".