18581725310881 has 4 divisors (see below), whose sum is σ = 18655756089264. Its totient is φ = 18507694532500.

The previous prime is 18581725310849. The next prime is 18581725310909. The reversal of 18581725310881 is 18801352718581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18581725310881 - 2⁵ = 18581725310849 is a prime.

It is a super-2 number, since 2×18581725310881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18581725310801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37015388815 + ... + 37015389316.

It is an arithmetic number, because the mean of its divisors is an integer number (4663939022316).

Almost surely, 2^{18581725310881} is an apocalyptic number.

It is an amenable number.

18581725310881 is a deficient number, since it is larger than the sum of its proper divisors (74030778383).

18581725310881 is an equidigital number, since it uses as much as digits as its factorization.

18581725310881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74030778382.

The product of its (nonzero) digits is 4300800, while the sum is 58.

The spelling of 18581725310881 in words is "eighteen trillion, five hundred eighty-one billion, seven hundred twenty-five million, three hundred ten thousand, eight hundred eighty-one".