644130600412 has 144 divisors (see below), whose sum is σ = 1294433784000. Its totient is φ = 278751559680.

The previous prime is 644130600361. The next prime is 644130600437. The reversal of 644130600412 is 214006031446.

It is a super-2 number, since 2×644130600412² (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 47 ways as a sum of consecutive naturals, for example, 1004883612 + ... + 1004884252.

It is an arithmetic number, because the mean of its divisors is an integer number (8989123500).

Almost surely, 2^644130600412 is an apocalyptic number.

It is an amenable number.

644130600412 is an abundant number, since it is smaller than the sum of its proper divisors (650303183588).

644130600412 is a wasteful number, since it uses less digits than its factorization.

644130600412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 644130600412 its reverse (214006031446), we get a palindrome (858136631858).

The spelling of 644130600412 in words is "six hundred forty-four billion, one hundred thirty million, six hundred thousand, four hundred twelve".