642444365344 has 12 divisors (see below), whose sum is σ = 1264812344334. Its totient is φ = 321222182656.

The previous prime is 642444365309. The next prime is 642444365359. The reversal of 642444365344 is 443563444246.

It can be written as a sum of positive squares in only one way, i.e., 573370012944 + 69074352400 = 757212^2 + 262820^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038193177 + ... + 10038193240.

Almost surely, 2^642444365344 is an apocalyptic number.

It is an amenable number.

642444365344 is a deficient number, since it is larger than the sum of its proper divisors (622367978990).

642444365344 is a wasteful number, since it uses less digits than its factorization.

642444365344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20076386427 (or 20076386419 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 49.

The spelling of 642444365344 in words is "six hundred forty-two billion, four hundred forty-four million, three hundred sixty-five thousand, three hundred forty-four".