638355734106 has 8 divisors (see below), whose sum is σ = 1276711468224. Its totient is φ = 212785244700.

The previous prime is 638355734101. The next prime is 638355734129. The reversal of 638355734106 is 601437553836.

It is a sphenic number, since it is the product of 3 distinct primes.

638355734106 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (638355734101) 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, 53196311170 + ... + 53196311181.

It is an arithmetic number, because the mean of its divisors is an integer number (159588933528).

Almost surely, 2^638355734106 is an apocalyptic number.

638355734106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638355734106 is a wasteful number, since it uses less digits than its factorization.

638355734106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106392622356.

The product of its (nonzero) digits is 5443200, while the sum is 51.

The spelling of 638355734106 in words is "six hundred thirty-eight billion, three hundred fifty-five million, seven hundred thirty-four thousand, one hundred six".