76320715661 has 2 divisors, whose sum is σ = 76320715662. Its totient is φ = 76320715660.

The previous prime is 76320715621. The next prime is 76320715697. The reversal of 76320715661 is 16651702367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71155562500 + 5165153161 = 266750^2 + 71869^2 .

It is a cyclic number.

It is not a de Polignac number, because 76320715661 - 2¹⁴ = 76320699277 is a prime.

It is a super-3 number, since 3×76320715661³ (a number of 34 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76320715621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38160357830 + 38160357831.

It is an arithmetic number, because the mean of its divisors is an integer number (38160357831).

Almost surely, 2^76320715661 is an apocalyptic number.

It is an amenable number.

76320715661 is a deficient number, since it is larger than the sum of its proper divisors (1).

76320715661 is an equidigital number, since it uses as much as digits as its factorization.

76320715661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 76320715661 in words is "seventy-six billion, three hundred twenty million, seven hundred fifteen thousand, six hundred sixty-one".