18731585357 has 2 divisors, whose sum is σ = 18731585358. Its totient is φ = 18731585356.

The previous prime is 18731585351. The next prime is 18731585387. The reversal of 18731585357 is 75358513781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15181689796 + 3549895561 = 123214^2 + 59581^2 .

It is a cyclic number.

It is not a de Polignac number, because 18731585357 - 2²⁴ = 18714808141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18731585299 and 18731585308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18731585351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365792678 + 9365792679.

It is an arithmetic number, because the mean of its divisors is an integer number (9365792679).

Almost surely, 2^18731585357 is an apocalyptic number.

It is an amenable number.

18731585357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18731585357 is an equidigital number, since it uses as much as digits as its factorization.

18731585357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528000, while the sum is 53.

The spelling of 18731585357 in words is "eighteen billion, seven hundred thirty-one million, five hundred eighty-five thousand, three hundred fifty-seven".