638102777538 has 16 divisors (see below), whose sum is σ = 1276733596320. Its totient is φ = 212612918976.

The previous prime is 638102777441. The next prime is 638102777561. The reversal of 638102777538 is 835777201836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21986008 + ... + 22015011.

It is an arithmetic number, because the mean of its divisors is an integer number (79795849770).

Almost surely, 2^638102777538 is an apocalyptic number.

638102777538 is an abundant number, since it is smaller than the sum of its proper divisors (638630818782).

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

638102777538 is a wasteful number, since it uses less digits than its factorization.

638102777538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44003441.

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 638102777538 in words is "six hundred thirty-eight billion, one hundred two million, seven hundred seventy-seven thousand, five hundred thirty-eight".