77766276061 has 2 divisors, whose sum is σ = 77766276062. Its totient is φ = 77766276060.

The previous prime is 77766276041. The next prime is 77766276079. The reversal of 77766276061 is 16067266777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77614616836 + 151659225 = 278594^2 + 12315^2 .

It is a cyclic number.

It is not a de Polignac number, because 77766276061 - 2⁷ = 77766275933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77766275993 and 77766276011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77766276001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38883138030 + 38883138031.

It is an arithmetic number, because the mean of its divisors is an integer number (38883138031).

Almost surely, 2^77766276061 is an apocalyptic number.

It is an amenable number.

77766276061 is a deficient number, since it is larger than the sum of its proper divisors (1).

77766276061 is an equidigital number, since it uses as much as digits as its factorization.

77766276061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6223392, while the sum is 55.

The spelling of 77766276061 in words is "seventy-seven billion, seven hundred sixty-six million, two hundred seventy-six thousand, sixty-one".