638353445402 has 32 divisors (see below), whose sum is σ = 1012450924800. Its totient is φ = 301021394688.

The previous prime is 638353445357. The next prime is 638353445413. The reversal of 638353445402 is 204544353836.

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, 36982358 + ... + 36999614.

It is an arithmetic number, because the mean of its divisors is an integer number (31639091400).

Almost surely, 2^638353445402 is an apocalyptic number.

638353445402 is a deficient number, since it is larger than the sum of its proper divisors (374097479398).

638353445402 is a wasteful number, since it uses less digits than its factorization.

638353445402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21590.

The product of its (nonzero) digits is 4147200, while the sum is 47.

The spelling of 638353445402 in words is "six hundred thirty-eight billion, three hundred fifty-three million, four hundred forty-five thousand, four hundred two".