11981164775 has 6 divisors (see below), whose sum is σ = 14856644352. Its totient is φ = 9584931800.

The previous prime is 11981164759. The next prime is 11981164823. The reversal of 11981164775 is 57746118911.

It is not a de Polignac number, because 11981164775 - 2⁴ = 11981164759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 239623271 + ... + 239623320.

It is an arithmetic number, because the mean of its divisors is an integer number (2476107392).

Almost surely, 2^11981164775 is an apocalyptic number.

11981164775 is a deficient number, since it is larger than the sum of its proper divisors (2875479577).

11981164775 is an equidigital number, since it uses as much as digits as its factorization.

11981164775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479246601 (or 479246596 counting only the distinct ones).

The product of its digits is 423360, while the sum is 50.

The spelling of 11981164775 in words is "eleven billion, nine hundred eighty-one million, one hundred sixty-four thousand, seven hundred seventy-five".