18659696137 has 4 divisors (see below), whose sum is σ = 18712556820. Its totient is φ = 18606835456.

The previous prime is 18659696119. The next prime is 18659696201. The reversal of 18659696137 is 73169695681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73169695681 = 39901 ⋅1833781.

It can be written as a sum of positive squares in 2 ways, for example, as 9028040256 + 9631655881 = 95016^2 + 98141^2 .

It is a cyclic number.

It is not a de Polignac number, because 18659696137 - 2¹⁹ = 18659171849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18659676137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26429812 + ... + 26430517.

It is an arithmetic number, because the mean of its divisors is an integer number (4678139205).

Almost surely, 2^18659696137 is an apocalyptic number.

It is an amenable number.

18659696137 is a deficient number, since it is larger than the sum of its proper divisors (52860683).

18659696137 is an equidigital number, since it uses as much as digits as its factorization.

18659696137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52860682.

The product of its digits is 14696640, while the sum is 61.

The spelling of 18659696137 in words is "eighteen billion, six hundred fifty-nine million, six hundred ninety-six thousand, one hundred thirty-seven".