80642662777 has 2 divisors, whose sum is σ = 80642662778. Its totient is φ = 80642662776.

The previous prime is 80642662703. The next prime is 80642662781. The reversal of 80642662777 is 77726624608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77601802041 + 3040860736 = 278571^2 + 55144^2 .

It is a cyclic number.

It is not a de Polignac number, because 80642662777 - 2²⁷ = 80508445049 is a prime.

It is not a weakly prime, because it can be changed into another prime (80642642777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40321331388 + 40321331389.

It is an arithmetic number, because the mean of its divisors is an integer number (40321331389).

Almost surely, 2^80642662777 is an apocalyptic number.

It is an amenable number.

80642662777 is a deficient number, since it is larger than the sum of its proper divisors (1).

80642662777 is an equidigital number, since it uses as much as digits as its factorization.

80642662777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 80642662777 in words is "eighty billion, six hundred forty-two million, six hundred sixty-two thousand, seven hundred seventy-seven".