638417830165 has 16 divisors (see below), whose sum is σ = 770134060800. Its totient is φ = 508046257152.

The previous prime is 638417830129. The next prime is 638417830279. The reversal of 638417830165 is 561038714836.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 638417830165 - 2²¹ = 638415733013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17775696 + ... + 17811574.

It is an arithmetic number, because the mean of its divisors is an integer number (48133378800).

Almost surely, 2^638417830165 is an apocalyptic number.

It is an amenable number.

638417830165 is a deficient number, since it is larger than the sum of its proper divisors (131716230635).

638417830165 is a wasteful number, since it uses less digits than its factorization.

638417830165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54516.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 638417830165 in words is "six hundred thirty-eight billion, four hundred seventeen million, eight hundred thirty thousand, one hundred sixty-five".