188890495613 has 4 divisors (see below), whose sum is σ = 188891373660. Its totient is φ = 188889617568.

The previous prime is 188890495579. The next prime is 188890495639. The reversal of 188890495613 is 316594098881.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 81491408089 + 107399087524 = 285467^2 + 327718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188890495613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188890465613) 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, 126431 + ... + 627507.

It is an arithmetic number, because the mean of its divisors is an integer number (47222843415).

Almost surely, 2^188890495613 is an apocalyptic number.

It is an amenable number.

188890495613 is a deficient number, since it is larger than the sum of its proper divisors (878047).

188890495613 is an equidigital number, since it uses as much as digits as its factorization.

188890495613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878046.

The product of its (nonzero) digits is 14929920, while the sum is 62.

The spelling of 188890495613 in words is "one hundred eighty-eight billion, eight hundred ninety million, four hundred ninety-five thousand, six hundred thirteen".