18113121761 has 32 divisors (see below), whose sum is σ = 21283637760. Its totient is φ = 15095808000.

The previous prime is 18113121757. The next prime is 18113121773. The reversal of 18113121761 is 16712131181.

It is not a de Polignac number, because 18113121761 - 2² = 18113121757 is a prime.

It is a super-2 number, since 2×18113121761² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18113121731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13921811 + ... + 13923111.

It is an arithmetic number, because the mean of its divisors is an integer number (665113680).

Almost surely, 2^18113121761 is an apocalyptic number.

It is an amenable number.

18113121761 is a deficient number, since it is larger than the sum of its proper divisors (3170515999).

18113121761 is a wasteful number, since it uses less digits than its factorization.

18113121761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745.

The product of its digits is 2016, while the sum is 32.

The spelling of 18113121761 in words is "eighteen billion, one hundred thirteen million, one hundred twenty-one thousand, seven hundred sixty-one".