645255632106244 has 12 divisors (see below), whose sum is σ = 1129197842401104. Its totient is φ = 322627677134504.

The previous prime is 645255632106161. The next prime is 645255632106247. The reversal of 645255632106244 is 442601236552546.

It is not an unprimeable number, because it can be changed into a prime (645255632106247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23903794 + ... + 43149769.

It is an arithmetic number, because the mean of its divisors is an integer number (94099820200092).

Almost surely, 2^{645255632106244} is an apocalyptic number.

It is an amenable number.

645255632106244 is a deficient number, since it is larger than the sum of its proper divisors (483942210294860).

645255632106244 is a wasteful number, since it uses less digits than its factorization.

645255632106244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69459314 (or 69459312 counting only the distinct ones).

The product of its (nonzero) digits is 41472000, while the sum is 55.

The spelling of 645255632106244 in words is "six hundred forty-five trillion, two hundred fifty-five billion, six hundred thirty-two million, one hundred six thousand, two hundred forty-four".