11981397186 has 48 divisors (see below), whose sum is σ = 28347564960. Its totient is φ = 3627149760.

The previous prime is 11981397179. The next prime is 11981397193. The reversal of 11981397186 is 68179318911.

It is an interprime number because it is at equal distance from previous prime (11981397179) and next prime (11981397193).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175245 + ... + 233823.

It is an arithmetic number, because the mean of its divisors is an integer number (590574270).

Almost surely, 2^11981397186 is an apocalyptic number.

11981397186 is an abundant number, since it is smaller than the sum of its proper divisors (16366167774).

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

11981397186 is a wasteful number, since it uses less digits than its factorization.

11981397186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59631 (or 59628 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The spelling of 11981397186 in words is "eleven billion, nine hundred eighty-one million, three hundred ninety-seven thousand, one hundred eighty-six".