639218812936 has 16 divisors (see below), whose sum is σ = 1307493026640. Its totient is φ = 290554005840.

The previous prime is 639218812933. The next prime is 639218812949.

639218812936 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×639218812936² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639218812933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3631924986 + ... + 3631925161.

It is an arithmetic number, because the mean of its divisors is an integer number (81718314165).

Almost surely, 2^639218812936 is an apocalyptic number.

It is an amenable number.

639218812936 is an abundant number, since it is smaller than the sum of its proper divisors (668274213704).

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

639218812936 is a wasteful number, since it uses less digits than its factorization.

639218812936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7263850164 (or 7263850160 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 58.

The spelling of 639218812936 in words is "six hundred thirty-nine billion, two hundred eighteen million, eight hundred twelve thousand, nine hundred thirty-six".