18477684131 has 2 divisors, whose sum is σ = 18477684132. Its totient is φ = 18477684130.

The previous prime is 18477684107. The next prime is 18477684151. The reversal of 18477684131 is 13148677481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18477684131 is a prime.

It is a super-2 number, since 2×18477684131² (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 18477684131.

It is not a weakly prime, because it can be changed into another prime (18477684101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9238842065 + 9238842066.

It is an arithmetic number, because the mean of its divisors is an integer number (9238842066).

Almost surely, 2^18477684131 is an apocalyptic number.

18477684131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18477684131 is an equidigital number, since it uses as much as digits as its factorization.

18477684131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The spelling of 18477684131 in words is "eighteen billion, four hundred seventy-seven million, six hundred eighty-four thousand, one hundred thirty-one".