639212885506 has 16 divisors (see below), whose sum is σ = 1056588027264. Its totient is φ = 288160370064.

The previous prime is 639212885471. The next prime is 639212885537. The reversal of 639212885506 is 605588212936.

It is a super-2 number, since 2×639212885506² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285872266 + ... + 285874501.

It is an arithmetic number, because the mean of its divisors is an integer number (66036751704).

Almost surely, 2^639212885506 is an apocalyptic number.

639212885506 is a deficient number, since it is larger than the sum of its proper divisors (417375141758).

639212885506 is a wasteful number, since it uses less digits than its factorization.

639212885506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571746825.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 639212885506 in words is "six hundred thirty-nine billion, two hundred twelve million, eight hundred eighty-five thousand, five hundred six".