77090612761 has 2 divisors, whose sum is σ = 77090612762. Its totient is φ = 77090612760.

The previous prime is 77090612737. The next prime is 77090612813. The reversal of 77090612761 is 16721609077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52553270025 + 24537342736 = 229245^2 + 156644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77090612761 is a prime.

It is not a weakly prime, because it can be changed into another prime (77090610761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38545306380 + 38545306381.

It is an arithmetic number, because the mean of its divisors is an integer number (38545306381).

Almost surely, 2^77090612761 is an apocalyptic number.

It is an amenable number.

77090612761 is a deficient number, since it is larger than the sum of its proper divisors (1).

77090612761 is an equidigital number, since it uses as much as digits as its factorization.

77090612761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 46.

The spelling of 77090612761 in words is "seventy-seven billion, ninety million, six hundred twelve thousand, seven hundred sixty-one".