638632744873 has 8 divisors (see below), whose sum is σ = 641482932992. Its totient is φ = 635788590336.

The previous prime is 638632744837. The next prime is 638632744913. The reversal of 638632744873 is 378447236836.

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

It is a cyclic number.

It is not a de Polignac number, because 638632744873 - 2²⁵ = 638599190441 is a prime.

It is a super-2 number, since 2×638632744873² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638632744073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296165 + ... + 1719682.

It is an arithmetic number, because the mean of its divisors is an integer number (80185366624).

Almost surely, 2^638632744873 is an apocalyptic number.

It is an amenable number.

638632744873 is a deficient number, since it is larger than the sum of its proper divisors (2850188119).

638632744873 is a wasteful number, since it uses less digits than its factorization.

638632744873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016791.

The product of its digits is 97542144, while the sum is 61.

The spelling of 638632744873 in words is "six hundred thirty-eight billion, six hundred thirty-two million, seven hundred forty-four thousand, eight hundred seventy-three".