11812117261 has 16 divisors (see below), whose sum is σ = 14089759488. Its totient is φ = 9691344000.

The previous prime is 11812117249. The next prime is 11812117297. The reversal of 11812117261 is 16271121811.

It is a cyclic number.

It is not a de Polignac number, because 11812117261 - 2²¹ = 11810020109 is a prime.

It is a super-2 number, since 2×11812117261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11812117231) 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, 373065 + ... + 403486.

It is an arithmetic number, because the mean of its divisors is an integer number (880609968).

Almost surely, 2^11812117261 is an apocalyptic number.

It is an amenable number.

11812117261 is a deficient number, since it is larger than the sum of its proper divisors (2277642227).

11812117261 is an equidigital number, since it uses as much as digits as its factorization.

11812117261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776652.

The product of its digits is 1344, while the sum is 31.

The spelling of 11812117261 in words is "eleven billion, eight hundred twelve million, one hundred seventeen thousand, two hundred sixty-one".