645321200252 has 12 divisors (see below), whose sum is σ = 1143607190880. Its totient is φ = 318576288576.

The previous prime is 645321200233. The next prime is 645321200261. The reversal of 645321200252 is 252002123546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021077533 + ... + 1021078164.

It is an arithmetic number, because the mean of its divisors is an integer number (95300599240).

Almost surely, 2^645321200252 is an apocalyptic number.

It is an amenable number.

645321200252 is a deficient number, since it is larger than the sum of its proper divisors (498285990628).

645321200252 is a wasteful number, since it uses less digits than its factorization.

645321200252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042155780 (or 2042155778 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 645321200252 its reverse (252002123546), we get a palindrome (897323323798).

The spelling of 645321200252 in words is "six hundred forty-five billion, three hundred twenty-one million, two hundred thousand, two hundred fifty-two".