645442460630 has 32 divisors (see below), whose sum is σ = 1273097806848. Its totient is φ = 233653845600.

The previous prime is 645442460629. The next prime is 645442460651. The reversal of 645442460630 is 36064244546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13131656 + ... + 13180715.

It is an arithmetic number, because the mean of its divisors is an integer number (39784306464).

Almost surely, 2^645442460630 is an apocalyptic number.

645442460630 is a deficient number, since it is larger than the sum of its proper divisors (627655346218).

645442460630 is a wasteful number, since it uses less digits than its factorization.

645442460630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26312612.

The product of its (nonzero) digits is 1658880, while the sum is 44.

The spelling of 645442460630 in words is "six hundred forty-five billion, four hundred forty-two million, four hundred sixty thousand, six hundred thirty".