15537994849 has 16 divisors (see below), whose sum is σ = 17736098688. Its totient is φ = 13484927232.

The previous prime is 15537994817. The next prime is 15537994853. The reversal of 15537994849 is 94849973551.

It is a cyclic number.

It is not a de Polignac number, because 15537994849 - 2⁵ = 15537994817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15537994889) 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, 177354 + ... + 250060.

It is an arithmetic number, because the mean of its divisors is an integer number (1108506168).

Almost surely, 2^15537994849 is an apocalyptic number.

It is an amenable number.

15537994849 is a deficient number, since it is larger than the sum of its proper divisors (2198103839).

15537994849 is a wasteful number, since it uses less digits than its factorization.

15537994849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73704.

The product of its digits is 48988800, while the sum is 64.

The spelling of 15537994849 in words is "fifteen billion, five hundred thirty-seven million, nine hundred ninety-four thousand, eight hundred forty-nine".