15868663231 has 2 divisors, whose sum is σ = 15868663232. Its totient is φ = 15868663230.

The previous prime is 15868663163. The next prime is 15868663241. The reversal of 15868663231 is 13236686851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15868663231 - 2²³ = 15860274623 is a prime.

It is a super-2 number, since 2×15868663231² (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 (15868663241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7934331615 + 7934331616.

It is an arithmetic number, because the mean of its divisors is an integer number (7934331616).

Almost surely, 2^15868663231 is an apocalyptic number.

15868663231 is a deficient number, since it is larger than the sum of its proper divisors (1).

15868663231 is an equidigital number, since it uses as much as digits as its factorization.

15868663231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 49.

The spelling of 15868663231 in words is "fifteen billion, eight hundred sixty-eight million, six hundred sixty-three thousand, two hundred thirty-one".