639157481076384 has 36 divisors (see below), whose sum is σ = 1817604086811786. Its totient is φ = 213052493692032.

The previous prime is 639157481076377. The next prime is 639157481076403. The reversal of 639157481076384 is 483670184751936.

639157481076384 is a `hidden beast` number, since 6 + 3 + 9 + 1 + 5 + 7 + 481 + 0 + 7 + 63 + 84 = 666.

639157481076384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 631190252250000 + 7967228826384 = 25123500^2 + 2822628^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×639157481076384³ (a number of 45 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1109648404359 + ... + 1109648404934.

Almost surely, 2^{639157481076384} is an apocalyptic number.

It is an amenable number.

639157481076384 is an abundant number, since it is smaller than the sum of its proper divisors (1178446605735402).

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

639157481076384 is a wasteful number, since it uses less digits than its factorization.

639157481076384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219296809309 (or 2219296809298 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 72.

The spelling of 639157481076384 in words is "six hundred thirty-nine trillion, one hundred fifty-seven billion, four hundred eighty-one million, seventy-six thousand, three hundred eighty-four".