11808606981 has 16 divisors (see below), whose sum is σ = 16375092800. Its totient is φ = 7563265920.

The previous prime is 11808606977. The next prime is 11808607033. The reversal of 11808606981 is 18960680811.

It is not a de Polignac number, because 11808606981 - 2² = 11808606977 is a prime.

It is a super-2 number, since 2×11808606981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11808606981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11808606911) 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, 742456 + ... + 758193.

It is an arithmetic number, because the mean of its divisors is an integer number (1023443300).

Almost surely, 2^11808606981 is an apocalyptic number.

It is an amenable number.

11808606981 is a deficient number, since it is larger than the sum of its proper divisors (4566485819).

11808606981 is a wasteful number, since it uses less digits than its factorization.

11808606981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500756.

The product of its (nonzero) digits is 165888, while the sum is 48.

The spelling of 11808606981 in words is "eleven billion, eight hundred eight million, six hundred six thousand, nine hundred eighty-one".