645220506424 has 32 divisors (see below), whose sum is σ = 1303113712320. Its totient is φ = 297733597056.

The previous prime is 645220506401. The next prime is 645220506493. The reversal of 645220506424 is 424605022546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113487 + ... + 1141630.

It is an arithmetic number, because the mean of its divisors is an integer number (40722303510).

Almost surely, 2^645220506424 is an apocalyptic number.

It is an amenable number.

645220506424 is an abundant number, since it is smaller than the sum of its proper divisors (657893205896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645220506424 is a wasteful number, since it uses less digits than its factorization.

645220506424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260079 (or 1260075 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

The spelling of 645220506424 in words is "six hundred forty-five billion, two hundred twenty million, five hundred six thousand, four hundred twenty-four".