15989858881 has 2 divisors, whose sum is σ = 15989858882. Its totient is φ = 15989858880.

The previous prime is 15989858873. The next prime is 15989858897. The reversal of 15989858881 is 18885898951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12982323600 + 3007535281 = 113940^2 + 54841^2 .

It is a cyclic number.

It is not a de Polignac number, because 15989858881 - 2³ = 15989858873 is a prime.

It is a super-2 number, since 2×15989858881² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15989858881.

It is not a weakly prime, because it can be changed into another prime (15989852881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7994929440 + 7994929441.

It is an arithmetic number, because the mean of its divisors is an integer number (7994929441).

Almost surely, 2^15989858881 is an apocalyptic number.

It is an amenable number.

15989858881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15989858881 is an equidigital number, since it uses as much as digits as its factorization.

15989858881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66355200, while the sum is 70.

The spelling of 15989858881 in words is "fifteen billion, nine hundred eighty-nine million, eight hundred fifty-eight thousand, eight hundred eighty-one".