638632386371 has 16 divisors (see below), whose sum is σ = 779888767680. Its totient is φ = 510472627200.

The previous prime is 638632386361. The next prime is 638632386377. The reversal of 638632386371 is 173683236836.

It is a happy number.

It is not a de Polignac number, because 638632386371 - 2⁶ = 638632386307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638632386377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24604730 + ... + 24630671.

It is an arithmetic number, because the mean of its divisors is an integer number (48743047980).

Almost surely, 2^638632386371 is an apocalyptic number.

638632386371 is a deficient number, since it is larger than the sum of its proper divisors (141256381309).

638632386371 is a wasteful number, since it uses less digits than its factorization.

638632386371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49235534.

The product of its digits is 15676416, while the sum is 56.

The spelling of 638632386371 in words is "six hundred thirty-eight billion, six hundred thirty-two million, three hundred eighty-six thousand, three hundred seventy-one".