188495492491 has 16 divisors (see below), whose sum is σ = 189964569600. Its totient is φ = 187033537600.

The previous prime is 188495492477. The next prime is 188495492503. The reversal of 188495492491 is 194294594881.

It is a cyclic number.

It is not a de Polignac number, because 188495492491 - 2²¹ = 188493395339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188495492411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120907170 + ... + 120908728.

It is an arithmetic number, because the mean of its divisors is an integer number (11872785600).

Almost surely, 2^188495492491 is an apocalyptic number.

188495492491 is the 232069-th nonagonal number.

188495492491 is a deficient number, since it is larger than the sum of its proper divisors (1469077109).

188495492491 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (188495492490) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (3290).

188495492491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290.

The product of its digits is 29859840, while the sum is 64.

The spelling of 188495492491 in words is "one hundred eighty-eight billion, four hundred ninety-five million, four hundred ninety-two thousand, four hundred ninety-one".