100660550491 has 4 divisors (see below), whose sum is σ = 100730796552. Its totient is φ = 100590304432.

The previous prime is 100660550483. The next prime is 100660550513. The reversal of 100660550491 is 194055066001.

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 100660550491 - 2³ = 100660550483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100660550491.

It is not an unprimeable number, because it can be changed into a prime (100660550791) 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, 35120881 + ... + 35123746.

It is an arithmetic number, because the mean of its divisors is an integer number (25182699138).

Almost surely, 2^100660550491 is an apocalyptic number.

100660550491 is a deficient number, since it is larger than the sum of its proper divisors (70246061).

100660550491 is an equidigital number, since it uses as much as digits as its factorization.

100660550491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70246060.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 100660550491 in words is "one hundred billion, six hundred sixty million, five hundred fifty thousand, four hundred ninety-one".