639197211624 has 16 divisors (see below), whose sum is σ = 1597993029120. Its totient is φ = 213065737200.

The previous prime is 639197211617. The next prime is 639197211629. The reversal of 639197211624 is 426112791936.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (639197211629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13316608552 + ... + 13316608599.

It is an arithmetic number, because the mean of its divisors is an integer number (99874564320).

Almost surely, 2^639197211624 is an apocalyptic number.

It is an amenable number.

639197211624 is an abundant number, since it is smaller than the sum of its proper divisors (958795817496).

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

639197211624 is a wasteful number, since it uses less digits than its factorization.

639197211624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26633217160 (or 26633217156 counting only the distinct ones).

The product of its digits is 979776, while the sum is 51.

The spelling of 639197211624 in words is "six hundred thirty-nine billion, one hundred ninety-seven million, two hundred eleven thousand, six hundred twenty-four".