18285886631 has 2 divisors, whose sum is σ = 18285886632. Its totient is φ = 18285886630.

The previous prime is 18285886607. The next prime is 18285886639. The reversal of 18285886631 is 13668858281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18285886631 - 2²⁶ = 18218777767 is a prime.

It is a super-2 number, since 2×18285886631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18285886639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9142943315 + 9142943316.

It is an arithmetic number, because the mean of its divisors is an integer number (9142943316).

Almost surely, 2^18285886631 is an apocalyptic number.

18285886631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18285886631 is an equidigital number, since it uses as much as digits as its factorization.

18285886631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4423680, while the sum is 56.

The spelling of 18285886631 in words is "eighteen billion, two hundred eighty-five million, eight hundred eighty-six thousand, six hundred thirty-one".