18354208881 has 16 divisors (see below), whose sum is σ = 25168549824. Its totient is φ = 11890893504.

The previous prime is 18354208861. The next prime is 18354208891. The reversal of 18354208881 is 18880245381.

It is not a de Polignac number, because 18354208881 - 2¹⁴ = 18354192497 is a prime.

It is a super-2 number, since 2×18354208881² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18354208881.

It is not an unprimeable number, because it can be changed into a prime (18354208801) 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, 335706 + ... + 386531.

It is an arithmetic number, because the mean of its divisors is an integer number (1573034364).

Almost surely, 2^18354208881 is an apocalyptic number.

It is an amenable number.

18354208881 is a deficient number, since it is larger than the sum of its proper divisors (6814340943).

18354208881 is a wasteful number, since it uses less digits than its factorization.

18354208881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722480.

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 18354208881 in words is "eighteen billion, three hundred fifty-four million, two hundred eight thousand, eight hundred eighty-one".