15813875641 has 4 divisors (see below), whose sum is σ = 15820940800. Its totient is φ = 15806810484.

The previous prime is 15813875573. The next prime is 15813875719. The reversal of 15813875641 is 14657831851.

It is a happy number.

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 15813875641 - 2¹⁵ = 15813842873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15813875941) 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, 3529221 + ... + 3533698.

It is an arithmetic number, because the mean of its divisors is an integer number (3955235200).

Almost surely, 2^15813875641 is an apocalyptic number.

It is an amenable number.

15813875641 is a deficient number, since it is larger than the sum of its proper divisors (7065159).

15813875641 is an equidigital number, since it uses as much as digits as its factorization.

15813875641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065158.

The product of its digits is 806400, while the sum is 49.

The spelling of 15813875641 in words is "fifteen billion, eight hundred thirteen million, eight hundred seventy-five thousand, six hundred forty-one".