644629517412 has 48 divisors (see below), whose sum is σ = 1519152940032. Its totient is φ = 212732301600.

The previous prime is 644629517333. The next prime is 644629517447. The reversal of 644629517412 is 214715926446.

It is a super-2 number, since 2×644629517412² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4586787 + ... + 4725237.

It is an arithmetic number, because the mean of its divisors is an integer number (31649019584).

Almost surely, 2^644629517412 is an apocalyptic number.

It is an amenable number.

644629517412 is an abundant number, since it is smaller than the sum of its proper divisors (874523422620).

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

644629517412 is a wasteful number, since it uses less digits than its factorization.

644629517412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142328 (or 142326 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The spelling of 644629517412 in words is "six hundred forty-four billion, six hundred twenty-nine million, five hundred seventeen thousand, four hundred twelve".