7798879993 has 2 divisors, whose sum is σ = 7798879994. Its totient is φ = 7798879992.

The previous prime is 7798879969. The next prime is 7798880009. The reversal of 7798879993 is 3999788977.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7043069929 + 755810064 = 83923^2 + 27492^2 .

It is an emirp because it is prime and its reverse (3999788977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7798879993 - 2⁵ = 7798879961 is a prime.

It is not a weakly prime, because it can be changed into another prime (7798879393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3899439996 + 3899439997.

It is an arithmetic number, because the mean of its divisors is an integer number (3899439997).

Almost surely, 2^7798879993 is an apocalyptic number.

It is an amenable number.

7798879993 is a deficient number, since it is larger than the sum of its proper divisors (1).

7798879993 is an equidigital number, since it uses as much as digits as its factorization.

7798879993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432081216, while the sum is 76.

The square root of 7798879993 is about 88311.2676446217. The cubic root of 7798879993 is about 1983.0975555105.

The spelling of 7798879993 in words is "seven billion, seven hundred ninety-eight million, eight hundred seventy-nine thousand, nine hundred ninety-three".