7997999999 has 8 divisors (see below), whose sum is σ = 8726424192. Its totient is φ = 7269798040.

The previous prime is 7997999983. The next prime is 7998000001. The reversal of 7997999999 is 9999997997.

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

It is a cyclic number.

It is not a de Polignac number, because 7997999999 - 2⁴ = 7997999983 is a prime.

It is a Duffinian number.

7997999999 is a modest number, since divided by 99999 gives 79979 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 7997999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997999909) 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, 24752 + ... + 128874.

It is an arithmetic number, because the mean of its divisors is an integer number (1090803024).

Almost surely, 2^7997999999 is an apocalyptic number.

7997999999 is a deficient number, since it is larger than the sum of its proper divisors (728424193).

7997999999 is a wasteful number, since it uses less digits than its factorization.

7997999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111117.

The product of its digits is 2109289329, while the sum is 86.

The square root of 7997999999 is about 89431.5380556546. The cubic root of 7997999999 is about 1999.8333193592.

The spelling of 7997999999 in words is "seven billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".