18713257633 has 12 divisors (see below), whose sum is σ = 21784123200. Its totient is φ = 16028411112.

The previous prime is 18713257583. The next prime is 18713257657. The reversal of 18713257633 is 33675231781.

It is a de Polignac number, because none of the positive numbers 2^k-18713257633 is a prime.

It is a super-2 number, since 2×18713257633² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18713257733) 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 in 11 ways as a sum of consecutive naturals, for example, 67941 + ... + 205042.

It is an arithmetic number, because the mean of its divisors is an integer number (1815343600).

Almost surely, 2^18713257633 is an apocalyptic number.

It is an amenable number.

18713257633 is a deficient number, since it is larger than the sum of its proper divisors (3070865567).

18713257633 is a wasteful number, since it uses less digits than its factorization.

18713257633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274396 (or 274389 counting only the distinct ones).

The product of its digits is 635040, while the sum is 46.

The spelling of 18713257633 in words is "eighteen billion, seven hundred thirteen million, two hundred fifty-seven thousand, six hundred thirty-three".