101815979938 has 4 divisors (see below), whose sum is σ = 152723969910. Its totient is φ = 50907989968.

The previous prime is 101815979929. The next prime is 101815979983. The reversal of 101815979938 is 839979518101.

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

It can be written as a sum of positive squares in only one way, i.e., 94761155889 + 7054824049 = 307833^2 + 83993^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25453994983 + ... + 25453994986.

Almost surely, 2^101815979938 is an apocalyptic number.

101815979938 is a deficient number, since it is larger than the sum of its proper divisors (50907989972).

101815979938 is an equidigital number, since it uses as much as digits as its factorization.

101815979938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50907989971.

The product of its (nonzero) digits is 4898880, while the sum is 61.

The spelling of 101815979938 in words is "one hundred one billion, eight hundred fifteen million, nine hundred seventy-nine thousand, nine hundred thirty-eight".