644699996446 has 8 divisors (see below), whose sum is σ = 1054963630584. Its totient is φ = 293045452920.

The previous prime is 644699996429. The next prime is 644699996477.

644699996446 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14652272625 + ... + 14652272668.

It is an arithmetic number, because the mean of its divisors is an integer number (131870453823).

Almost surely, 2^644699996446 is an apocalyptic number.

644699996446 is a deficient number, since it is larger than the sum of its proper divisors (410263634138).

644699996446 is a wasteful number, since it uses less digits than its factorization.

644699996446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29304545306.

The product of its digits is 2176782336, while the sum is 76.

The spelling of 644699996446 in words is "six hundred forty-four billion, six hundred ninety-nine million, nine hundred ninety-six thousand, four hundred forty-six".