15984509497 has 16 divisors (see below), whose sum is σ = 17859029760. Its totient is φ = 14180821200.

The previous prime is 15984509491. The next prime is 15984509531. The reversal of 15984509497 is 79490548951.

It is a cyclic number.

It is not a de Polignac number, because 15984509497 - 2¹⁹ = 15983985209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15984509491) 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, 539454 + ... + 568312.

It is an arithmetic number, because the mean of its divisors is an integer number (1116189360).

Almost surely, 2^15984509497 is an apocalyptic number.

It is an amenable number.

15984509497 is a deficient number, since it is larger than the sum of its proper divisors (1874520263).

15984509497 is a wasteful number, since it uses less digits than its factorization.

15984509497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30084.

The product of its (nonzero) digits is 16329600, while the sum is 61.

The spelling of 15984509497 in words is "fifteen billion, nine hundred eighty-four million, five hundred nine thousand, four hundred ninety-seven".