644652464256446 has 32 divisors (see below), whose sum is σ = 1012502515691520. Its totient is φ = 307452550204800.

The previous prime is 644652464256331. The next prime is 644652464256461.

644652464256446 is nontrivially palindromic in base 10.

It is a congruent number.

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, 3317771 + ... + 36059846.

It is an arithmetic number, because the mean of its divisors is an integer number (31640703615360).

Almost surely, 2^{644652464256446} is an apocalyptic number.

644652464256446 is a deficient number, since it is larger than the sum of its proper divisors (367850051435074).

644652464256446 is a wasteful number, since it uses less digits than its factorization.

644652464256446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39381440.

The product of its digits is 3185049600, while the sum is 68.

The spelling of 644652464256446 in words is "six hundred forty-four trillion, six hundred fifty-two billion, four hundred sixty-four million, two hundred fifty-six thousand, four hundred forty-six".