638680180022 has 8 divisors (see below), whose sum is σ = 968784543000. Its totient is φ = 315751999024.

The previous prime is 638680180013. The next prime is 638680180079. The reversal of 638680180022 is 220081086836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794045272 + ... + 1794045627.

It is an arithmetic number, because the mean of its divisors is an integer number (121098067875).

Almost surely, 2^638680180022 is an apocalyptic number.

638680180022 is a deficient number, since it is larger than the sum of its proper divisors (330104362978).

638680180022 is a wasteful number, since it uses less digits than its factorization.

638680180022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588090990.

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 638680180022 in words is "six hundred thirty-eight billion, six hundred eighty million, one hundred eighty thousand, twenty-two".