7717965121 has 2 divisors, whose sum is σ = 7717965122. Its totient is φ = 7717965120.

The previous prime is 7717965097. The next prime is 7717965139. The reversal of 7717965121 is 1215697177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3958926400 + 3759038721 = 62920^2 + 61311^2 .

It is a cyclic number.

It is not a de Polignac number, because 7717965121 - 2⁵ = 7717965089 is a prime.

It is not a weakly prime, because it can be changed into another prime (7717965181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3858982560 + 3858982561.

It is an arithmetic number, because the mean of its divisors is an integer number (3858982561).

Almost surely, 2^7717965121 is an apocalyptic number.

It is an amenable number.

7717965121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7717965121 is an equidigital number, since it uses as much as digits as its factorization.

7717965121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 46.

The square root of 7717965121 is about 87851.9500125068. The cubic root of 7717965121 is about 1976.2153601355.

The spelling of 7717965121 in words is "seven billion, seven hundred seventeen million, nine hundred sixty-five thousand, one hundred twenty-one".