77956265977 has 2 divisors, whose sum is σ = 77956265978. Its totient is φ = 77956265976.

The previous prime is 77956265971. The next prime is 77956266013.

77956265977 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71454101481 + 6502164496 = 267309^2 + 80636^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 77956265977 - 2³⁵ = 43596527609 is a prime.

It is a super-3 number, since 3×77956265977³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (77956265971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38978132988 + 38978132989.

It is an arithmetic number, because the mean of its divisors is an integer number (38978132989).

Almost surely, 2^77956265977 is an apocalyptic number.

It is an amenable number.

77956265977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77956265977 is an equidigital number, since it uses as much as digits as its factorization.

77956265977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350065800, while the sum is 70.

The spelling of 77956265977 in words is "seventy-seven billion, nine hundred fifty-six million, two hundred sixty-five thousand, nine hundred seventy-seven".