18087951593 has 2 divisors, whose sum is σ = 18087951594. Its totient is φ = 18087951592.

The previous prime is 18087951577. The next prime is 18087951613. The reversal of 18087951593 is 39515978081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18041056489 + 46895104 = 134317^2 + 6848^2 .

It is a cyclic number.

It is not a de Polignac number, because 18087951593 - 2⁴ = 18087951577 is a prime.

It is a super-2 number, since 2×18087951593² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18087951523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043975796 + 9043975797.

It is an arithmetic number, because the mean of its divisors is an integer number (9043975797).

Almost surely, 2^18087951593 is an apocalyptic number.

It is an amenable number.

18087951593 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087951593 is an equidigital number, since it uses as much as digits as its factorization.

18087951593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 18087951593 in words is "eighteen billion, eighty-seven million, nine hundred fifty-one thousand, five hundred ninety-three".