15660798897 has 4 divisors (see below), whose sum is σ = 20881065200. Its totient is φ = 10440532596.

The previous prime is 15660798859. The next prime is 15660798899. The reversal of 15660798897 is 79889706651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15660798897 - 2¹⁴ = 15660782513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15660798899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610133147 + ... + 2610133152.

It is an arithmetic number, because the mean of its divisors is an integer number (5220266300).

Almost surely, 2^15660798897 is an apocalyptic number.

It is an amenable number.

15660798897 is a deficient number, since it is larger than the sum of its proper divisors (5220266303).

15660798897 is an equidigital number, since it uses as much as digits as its factorization.

15660798897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220266302.

The product of its (nonzero) digits is 45722880, while the sum is 66.

The spelling of 15660798897 in words is "fifteen billion, six hundred sixty million, seven hundred ninety-eight thousand, eight hundred ninety-seven".