11861345181 has 24 divisors (see below), whose sum is σ = 18418224864. Its totient is φ = 6770161440.

The previous prime is 11861345063. The next prime is 11861345183. The reversal of 11861345181 is 18154316811.

It is a happy number.

It is not a de Polignac number, because 11861345181 - 2¹⁵ = 11861312413 is a prime.

It is a super-2 number, since 2×11861345181² (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 (11861345183) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84111 + ... + 175491.

It is an arithmetic number, because the mean of its divisors is an integer number (767426036).

Almost surely, 2^11861345181 is an apocalyptic number.

It is an amenable number.

11861345181 is a deficient number, since it is larger than the sum of its proper divisors (6556879683).

11861345181 is an equidigital number, since it uses as much as digits as its factorization.

11861345181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92281 (or 92274 counting only the distinct ones).

The product of its digits is 23040, while the sum is 39.

The spelling of 11861345181 in words is "eleven billion, eight hundred sixty-one million, three hundred forty-five thousand, one hundred eighty-one".