18525535631 has 2 divisors, whose sum is σ = 18525535632. Its totient is φ = 18525535630.

The previous prime is 18525535619. The next prime is 18525535649. The reversal of 18525535631 is 13653552581.

It is a weak prime.

It is an emirp because it is prime and its reverse (13653552581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18525535631 - 2²² = 18521341327 is a prime.

It is a super-2 number, since 2×18525535631² (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 (18525535601) 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, 9262767815 + 9262767816.

It is an arithmetic number, because the mean of its divisors is an integer number (9262767816).

Almost surely, 2^18525535631 is an apocalyptic number.

18525535631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18525535631 is an equidigital number, since it uses as much as digits as its factorization.

18525535631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540000, while the sum is 44.

The spelling of 18525535631 in words is "eighteen billion, five hundred twenty-five million, five hundred thirty-five thousand, six hundred thirty-one".