799740015521 has 4 divisors (see below), whose sum is σ = 799743457200. Its totient is φ = 799736573844.

The previous prime is 799740015511. The next prime is 799740015523. The reversal of 799740015521 is 125510047997.

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 a de Polignac number, because none of the positive numbers 2^k-799740015521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 799740015521.

It is not an unprimeable number, because it can be changed into a prime (799740015523) 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, 1344911 + ... + 1846148.

It is an arithmetic number, because the mean of its divisors is an integer number (199935864300).

Almost surely, 2^799740015521 is an apocalyptic number.

It is an amenable number.

799740015521 is a deficient number, since it is larger than the sum of its proper divisors (3441679).

799740015521 is a wasteful number, since it uses less digits than its factorization.

799740015521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3441678.

The product of its (nonzero) digits is 793800, while the sum is 50.

The spelling of 799740015521 in words is "seven hundred ninety-nine billion, seven hundred forty million, fifteen thousand, five hundred twenty-one".