644118499130 has 32 divisors (see below), whose sum is σ = 1165232528640. Its totient is φ = 256356757440.

The previous prime is 644118499111. The next prime is 644118499147. The reversal of 644118499130 is 31994811446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1894481 + ... + 2208459.

It is an arithmetic number, because the mean of its divisors is an integer number (36413516520).

Almost surely, 2^644118499130 is an apocalyptic number.

644118499130 is a deficient number, since it is larger than the sum of its proper divisors (521114029510).

644118499130 is a wasteful number, since it uses less digits than its factorization.

644118499130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315014.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 644118499130 in words is "six hundred forty-four billion, one hundred eighteen million, four hundred ninety-nine thousand, one hundred thirty".