644466065011230 has 128 divisors (see below), whose sum is σ = 1928388984431616. Its totient is φ = 133914151296000.

The previous prime is 644466065011213. The next prime is 644466065011247. The reversal of 644466065011230 is 32110560664446.

It is an interprime number because it is at equal distance from previous prime (644466065011213) and next prime (644466065011247).

It is a super-2 number, since 2×644466065011230² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 644466065011230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 388640944 + ... + 390295676.

It is an arithmetic number, because the mean of its divisors is an integer number (15065538940872).

Almost surely, 2^{644466065011230} is an apocalyptic number.

644466065011230 is an abundant number, since it is smaller than the sum of its proper divisors (1283922919420386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644466065011230 is a wasteful number, since it uses less digits than its factorization.

644466065011230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823362.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 644466065011230 in words is "six hundred forty-four trillion, four hundred sixty-six billion, sixty-five million, eleven thousand, two hundred thirty".