18696018631 has 2 divisors, whose sum is σ = 18696018632. Its totient is φ = 18696018630.

The previous prime is 18696018581. The next prime is 18696018647. The reversal of 18696018631 is 13681069681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18696018631 - 2¹⁵ = 18695985863 is a prime.

It is a super-4 number, since 4×18696018631⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18696018661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9348009315 + 9348009316.

It is an arithmetic number, because the mean of its divisors is an integer number (9348009316).

Almost surely, 2^18696018631 is an apocalyptic number.

18696018631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18696018631 is an equidigital number, since it uses as much as digits as its factorization.

18696018631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 18696018631 in words is "eighteen billion, six hundred ninety-six million, eighteen thousand, six hundred thirty-one".