644665413014 has 16 divisors (see below), whose sum is σ = 1115469128448. Its totient is φ = 273703071912.

The previous prime is 644665412987. The next prime is 644665413043. The reversal of 644665413014 is 410314566446.

It is a happy number.

It is a super-2 number, since 2×644665413014² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215173874 + ... + 215176869.

It is an arithmetic number, because the mean of its divisors is an integer number (69716820528).

Almost surely, 2^644665413014 is an apocalyptic number.

644665413014 is a deficient number, since it is larger than the sum of its proper divisors (470803715434).

644665413014 is a wasteful number, since it uses less digits than its factorization.

644665413014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430350859.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 644665413014 in words is "six hundred forty-four billion, six hundred sixty-five million, four hundred thirteen thousand, fourteen".