7999779997 has 8 divisors (see below), whose sum is σ = 8728101792. Its totient is φ = 7271636400.

The previous prime is 7999779979. The next prime is 7999780057.

7999779997 is nontrivially palindromic in base 10.

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 7999779997 - 2⁷ = 7999779869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7999779997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999779917) 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, 60003 + ... + 139999.

It is an arithmetic number, because the mean of its divisors is an integer number (1091012724).

Almost surely, 2^7999779997 is an apocalyptic number.

It is an amenable number.

7999779997 is a deficient number, since it is larger than the sum of its proper divisors (728321795).

7999779997 is a wasteful number, since it uses less digits than its factorization.

7999779997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89099.

The product of its digits is 1275989841, while the sum is 82.

The square root of 7999779997 is about 89441.4892373780. The cubic root of 7999779997 is about 1999.9816662486.

The spelling of 7999779997 in words is "seven billion, nine hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred ninety-seven".