18374604881 has 4 divisors (see below), whose sum is σ = 18556531764. Its totient is φ = 18192678000.

The previous prime is 18374604877. The next prime is 18374604889. The reversal of 18374604881 is 18840647381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14594814481 + 3779790400 = 120809^2 + 61480^2 .

It is a cyclic number.

It is not a de Polignac number, because 18374604881 - 2² = 18374604877 is a prime.

It is a super-2 number, since 2×18374604881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18374604889) 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, 90963290 + ... + 90963491.

It is an arithmetic number, because the mean of its divisors is an integer number (4639132941).

Almost surely, 2^18374604881 is an apocalyptic number.

It is an amenable number.

18374604881 is a deficient number, since it is larger than the sum of its proper divisors (181926883).

18374604881 is a wasteful number, since it uses less digits than its factorization.

18374604881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181926882.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 18374604881 in words is "eighteen billion, three hundred seventy-four million, six hundred four thousand, eight hundred eighty-one".