15871604971 has 4 divisors (see below), whose sum is σ = 15938013600. Its totient is φ = 15805196344.

The previous prime is 15871604941. The next prime is 15871605007. The reversal of 15871604971 is 17940617851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15871604971 - 2⁹ = 15871604459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15871604941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33203956 + ... + 33204433.

It is an arithmetic number, because the mean of its divisors is an integer number (3984503400).

Almost surely, 2^15871604971 is an apocalyptic number.

15871604971 is a deficient number, since it is larger than the sum of its proper divisors (66408629).

15871604971 is an equidigital number, since it uses as much as digits as its factorization.

15871604971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66408628.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 15871604971 in words is "fifteen billion, eight hundred seventy-one million, six hundred four thousand, nine hundred seventy-one".