7991418791 has 8 divisors (see below), whose sum is σ = 8438562480. Its totient is φ = 7546929408.

The previous prime is 7991418779. The next prime is 7991418881. The reversal of 7991418791 is 1978141997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7991418791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991118791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657386 + ... + 669431.

It is an arithmetic number, because the mean of its divisors is an integer number (1054820310).

Almost surely, 2^7991418791 is an apocalyptic number.

7991418791 is a deficient number, since it is larger than the sum of its proper divisors (447143689).

7991418791 is a wasteful number, since it uses less digits than its factorization.

7991418791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327153.

The product of its digits is 1143072, while the sum is 56.

The square root of 7991418791 is about 89394.7358125746. The cubic root of 7991418791 is about 1999.2846434130.

The spelling of 7991418791 in words is "seven billion, nine hundred ninety-one million, four hundred eighteen thousand, seven hundred ninety-one".