638196659233 has 12 divisors (see below), whose sum is σ = 742444453872. Its totient is φ = 546987081480.

The previous prime is 638196659189. The next prime is 638196659249. The reversal of 638196659233 is 332956691836.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-638196659233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638196659293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252318 + ... + 1157608.

It is an arithmetic number, because the mean of its divisors is an integer number (61870371156).

Almost surely, 2^638196659233 is an apocalyptic number.

It is an amenable number.

638196659233 is a deficient number, since it is larger than the sum of its proper divisors (104247794639).

638196659233 is a wasteful number, since it uses less digits than its factorization.

638196659233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919692 (or 919685 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 61.

The spelling of 638196659233 in words is "six hundred thirty-eight billion, one hundred ninety-six million, six hundred fifty-nine thousand, two hundred thirty-three".