15660500001 has 4 divisors (see below), whose sum is σ = 20880666672. Its totient is φ = 10440333332.

The previous prime is 15660499999. The next prime is 15660500039. The reversal of 15660500001 is 10000506651.

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 a cyclic number.

It is not a de Polignac number, because 15660500001 - 2¹ = 15660499999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15660500081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610083331 + ... + 2610083336.

It is an arithmetic number, because the mean of its divisors is an integer number (5220166668).

Almost surely, 2^15660500001 is an apocalyptic number.

It is an amenable number.

15660500001 is a deficient number, since it is larger than the sum of its proper divisors (5220166671).

15660500001 is an equidigital number, since it uses as much as digits as its factorization.

15660500001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220166670.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 15660500001 in words is "fifteen billion, six hundred sixty million, five hundred thousand, one".