15868859044 has 12 divisors (see below), whose sum is σ = 28728107100. Its totient is φ = 7660828448.

The previous prime is 15868859023. The next prime is 15868859051. The reversal of 15868859044 is 44095886851.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8124859044 + 7744000000 = 90138^2 + 88000^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 15868859044.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68400139 + ... + 68400370.

It is an arithmetic number, because the mean of its divisors is an integer number (2394008925).

Almost surely, 2^15868859044 is an apocalyptic number.

It is an amenable number.

15868859044 is a deficient number, since it is larger than the sum of its proper divisors (12859248056).

15868859044 is a wasteful number, since it uses less digits than its factorization.

15868859044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136800542 (or 136800540 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 15868859044 in words is "fifteen billion, eight hundred sixty-eight million, eight hundred fifty-nine thousand, forty-four".