645565222424 has 32 divisors (see below), whose sum is σ = 1214583992640. Its totient is φ = 321676951200.

The previous prime is 645565222349. The next prime is 645565222439. The reversal of 645565222424 is 424222565546.

645565222424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6653927 + ... + 6750249.

It is an arithmetic number, because the mean of its divisors is an integer number (37955749770).

Almost surely, 2^645565222424 is an apocalyptic number.

It is an amenable number.

645565222424 is a deficient number, since it is larger than the sum of its proper divisors (569018770216).

645565222424 is a wasteful number, since it uses less digits than its factorization.

645565222424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99191 (or 99187 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 47.

The spelling of 645565222424 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred twenty-two thousand, four hundred twenty-four".