77609072977 has 2 divisors, whose sum is σ = 77609072978. Its totient is φ = 77609072976.

The previous prime is 77609072951. The next prime is 77609073011. The reversal of 77609072977 is 77927090677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70924211856 + 6684861121 = 266316^2 + 81761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77609072977 is a prime.

It is not a weakly prime, because it can be changed into another prime (77609072917) 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, 38804536488 + 38804536489.

It is an arithmetic number, because the mean of its divisors is an integer number (38804536489).

Almost surely, 2^77609072977 is an apocalyptic number.

It is an amenable number.

77609072977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77609072977 is an equidigital number, since it uses as much as digits as its factorization.

77609072977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16336404, while the sum is 61.

The spelling of 77609072977 in words is "seventy-seven billion, six hundred nine million, seventy-two thousand, nine hundred seventy-seven".