639996852984148 has 24 divisors (see below), whose sum is σ = 1221812824798944. Its totient is φ = 290907505466400.

The previous prime is 639996852984019. The next prime is 639996852984187. The reversal of 639996852984148 is 841489258699936.

It is a super-2 number, since 2×639996852984148² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 138146203 + ... + 142703773.

It is an arithmetic number, because the mean of its divisors is an integer number (50908867699956).

Almost surely, 2^{639996852984148} is an apocalyptic number.

It is an amenable number.

639996852984148 is a deficient number, since it is larger than the sum of its proper divisors (581815971814796).

639996852984148 is a wasteful number, since it uses less digits than its factorization.

639996852984148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7749063 (or 7749061 counting only the distinct ones).

The product of its digits is 58047528960, while the sum is 91.

The spelling of 639996852984148 in words is "six hundred thirty-nine trillion, nine hundred ninety-six billion, eight hundred fifty-two million, nine hundred eighty-four thousand, one hundred forty-eight".