639788749146 has 16 divisors (see below), whose sum is σ = 1421752776000. Its totient is φ = 213262916364.

The previous prime is 639788749091. The next prime is 639788749169. The reversal of 639788749146 is 641947887936.

639788749146 is a `hidden beast` number, since 6 + 3 + 97 + 8 + 8 + 7 + 491 + 46 = 666.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

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, 5923969846 + ... + 5923969953.

It is an arithmetic number, because the mean of its divisors is an integer number (88859548500).

Almost surely, 2^639788749146 is an apocalyptic number.

639788749146 is an abundant number, since it is smaller than the sum of its proper divisors (781964026854).

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

639788749146 is a wasteful number, since it uses less digits than its factorization.

639788749146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11847939810 (or 11847939804 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 72.

The spelling of 639788749146 in words is "six hundred thirty-nine billion, seven hundred eighty-eight million, seven hundred forty-nine thousand, one hundred forty-six".