18257206631 has 2 divisors, whose sum is σ = 18257206632. Its totient is φ = 18257206630.

The previous prime is 18257206601. The next prime is 18257206789. The reversal of 18257206631 is 13660275281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18257206631 is a prime.

It is a super-4 number, since 4×18257206631⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18257206601) 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, 9128603315 + 9128603316.

It is an arithmetic number, because the mean of its divisors is an integer number (9128603316).

Almost surely, 2^18257206631 is an apocalyptic number.

18257206631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18257206631 is an equidigital number, since it uses as much as digits as its factorization.

18257206631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 18257206631 in words is "eighteen billion, two hundred fifty-seven million, two hundred six thousand, six hundred thirty-one".