639816901482168 has 96 divisors (see below), whose sum is σ = 1750738744918800. Its totient is φ = 211069156091904.

The previous prime is 639816901482127. The next prime is 639816901482169. The reversal of 639816901482168 is 861284109618936.

639816901482168 is a `hidden beast` number, since 6 + 3 + 9 + 81 + 6 + 9 + 0 + 1 + 482 + 1 + 68 = 666.

639816901482168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 639816901482096 and 639816901482105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639816901482169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338010663 + ... + 339898281.

Almost surely, 2^{639816901482168} is an apocalyptic number.

It is an amenable number.

639816901482168 is an abundant number, since it is smaller than the sum of its proper divisors (1110921843436632).

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

639816901482168 is a wasteful number, since it uses less digits than its factorization.

639816901482168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936261 (or 1936254 counting only the distinct ones).

The product of its (nonzero) digits is 214990848, while the sum is 72.

The spelling of 639816901482168 in words is "six hundred thirty-nine trillion, eight hundred sixteen billion, nine hundred one million, four hundred eighty-two thousand, one hundred sixty-eight".