638355354211 has 4 divisors (see below), whose sum is σ = 651937383072. Its totient is φ = 624773325352.

The previous prime is 638355354187. The next prime is 638355354223. The reversal of 638355354211 is 112453553836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638355354211 - 2²⁹ = 637818483299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638355354811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6791014360 + ... + 6791014453.

It is an arithmetic number, because the mean of its divisors is an integer number (162984345768).

Almost surely, 2^638355354211 is an apocalyptic number.

638355354211 is a deficient number, since it is larger than the sum of its proper divisors (13582028861).

638355354211 is a wasteful number, since it uses less digits than its factorization.

638355354211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13582028860.

The product of its digits is 1296000, while the sum is 46.

The spelling of 638355354211 in words is "six hundred thirty-eight billion, three hundred fifty-five million, three hundred fifty-four thousand, two hundred eleven".