7991560809 has 12 divisors (see below), whose sum is σ = 11715655536. Its totient is φ = 5248188792.

The previous prime is 7991560771. The next prime is 7991560831. The reversal of 7991560809 is 9080651997.

7991560809 is a `hidden beast` number, since 79 + 9 + 1 + 560 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 7991560809 - 2¹¹ = 7991558761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7991560859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6625899 + ... + 6627104.

It is an arithmetic number, because the mean of its divisors is an integer number (976304628).

Almost surely, 2^7991560809 is an apocalyptic number.

It is an amenable number.

7991560809 is a deficient number, since it is larger than the sum of its proper divisors (3724094727).

7991560809 is a wasteful number, since it uses less digits than its factorization.

7991560809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13253076 (or 13253073 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 7991560809 is about 89395.5301399348. The cubic root of 7991560809 is about 1999.2964866468.

The spelling of 7991560809 in words is "seven billion, nine hundred ninety-one million, five hundred sixty thousand, eight hundred nine".