15899491297 has 16 divisors (see below), whose sum is σ = 16521431760. Its totient is φ = 15288680448.

The previous prime is 15899491291. The next prime is 15899491331. The reversal of 15899491297 is 79219499851.

It can be written as a sum of positive squares in 8 ways, for example, as 740710656 + 15158780641 = 27216^2 + 123121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15899491297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15899491291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1153953 + ... + 1167649.

It is an arithmetic number, because the mean of its divisors is an integer number (1032589485).

Almost surely, 2^15899491297 is an apocalyptic number.

It is an amenable number.

15899491297 is a deficient number, since it is larger than the sum of its proper divisors (621940463).

15899491297 is a wasteful number, since it uses less digits than its factorization.

15899491297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100.

The product of its digits is 14696640, while the sum is 64.

The spelling of 15899491297 in words is "fifteen billion, eight hundred ninety-nine million, four hundred ninety-one thousand, two hundred ninety-seven".