15945668889 has 16 divisors (see below), whose sum is σ = 22400155200. Its totient is φ = 10061827776.

The previous prime is 15945668833. The next prime is 15945668899. The reversal of 15945668889 is 98886654951.

It is not a de Polignac number, because 15945668889 - 2¹² = 15945664793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15945668899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62914 + ... + 189339.

It is an arithmetic number, because the mean of its divisors is an integer number (1400009700).

Almost surely, 2^15945668889 is an apocalyptic number.

15945668889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15945668889 is a deficient number, since it is larger than the sum of its proper divisors (6454486311).

15945668889 is a wasteful number, since it uses less digits than its factorization.

15945668889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253384.

The product of its digits is 149299200, while the sum is 69.

The spelling of 15945668889 in words is "fifteen billion, nine hundred forty-five million, six hundred sixty-eight thousand, eight hundred eighty-nine".