638353445403 has 16 divisors (see below), whose sum is σ = 854898620576. Its totient is φ = 423689564160.

The previous prime is 638353445357. The next prime is 638353445413. The reversal of 638353445403 is 304544353836.

It is a de Polignac number, because none of the positive numbers 2^k-638353445403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638353445413) 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, 2625951 + ... + 2858727.

It is an arithmetic number, because the mean of its divisors is an integer number (53431163786).

Almost surely, 2^638353445403 is an apocalyptic number.

638353445403 is a deficient number, since it is larger than the sum of its proper divisors (216545175173).

638353445403 is a wasteful number, since it uses less digits than its factorization.

638353445403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236814.

The product of its (nonzero) digits is 6220800, while the sum is 48.

The spelling of 638353445403 in words is "six hundred thirty-eight billion, three hundred fifty-three million, four hundred forty-five thousand, four hundred three".