100639740995578 has 4 divisors (see below), whose sum is σ = 150959611493370. Its totient is φ = 50319870497788.

The previous prime is 100639740995557. The next prime is 100639740995587. The reversal of 100639740995578 is 875599047936001.

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., 93283782672609 + 7355958322969 = 9658353^2 + 2712187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100639740995578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25159935248893 + ... + 25159935248896.

Almost surely, 2^{100639740995578} is an apocalyptic number.

100639740995578 is a deficient number, since it is larger than the sum of its proper divisors (50319870497792).

100639740995578 is an equidigital number, since it uses as much as digits as its factorization.

100639740995578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50319870497791.

The product of its (nonzero) digits is 514382400, while the sum is 73.

The spelling of 100639740995578 in words is "one hundred trillion, six hundred thirty-nine billion, seven hundred forty million, nine hundred ninety-five thousand, five hundred seventy-eight".