7799999999977 has 2 divisors, whose sum is σ = 7799999999978. Its totient is φ = 7799999999976.

The previous prime is 7799999999951. The next prime is 7799999999983.

7799999999977 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4675363983081 + 3124636016896 = 2162259^2 + 1767664^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 7799999999977 - 2⁷ = 7799999999849 is a prime.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (7799999999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3899999999988 + 3899999999989.

It is an arithmetic number, because the mean of its divisors is an integer number (3899999999989).

Almost surely, 2^{7799999999977} is an apocalyptic number.

It is an amenable number.

7799999999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

7799999999977 is an equidigital number, since it uses as much as digits as its factorization.

7799999999977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 930196594089, while the sum is 109.

The spelling of 7799999999977 in words is "seven trillion, seven hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".