11198921658 has 32 divisors (see below), whose sum is σ = 22690809600. Its totient is φ = 3684185856.

The previous prime is 11198921653. The next prime is 11198921681. The reversal of 11198921658 is 85612989111.

It is a self number, because there is not a number n which added to its sum of digits gives 11198921658.

It is not an unprimeable number, because it can be changed into a prime (11198921653) 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, 1965678 + ... + 1971366.

It is an arithmetic number, because the mean of its divisors is an integer number (709087800).

Almost surely, 2^11198921658 is an apocalyptic number.

11198921658 is an abundant number, since it is smaller than the sum of its proper divisors (11491887942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11198921658 is a wasteful number, since it uses less digits than its factorization.

11198921658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9926.

The product of its digits is 311040, while the sum is 51.

The spelling of 11198921658 in words is "eleven billion, one hundred ninety-eight million, nine hundred twenty-one thousand, six hundred fifty-eight".