77728670732969 has 2 divisors, whose sum is σ = 77728670732970. Its totient is φ = 77728670732968.

The previous prime is 77728670732953. The next prime is 77728670732981. The reversal of 77728670732969 is 96923707682777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69286229107225 + 8442441625744 = 8323835^2 + 2905588^2 .

It is a cyclic number.

It is not a de Polignac number, because 77728670732969 - 2⁴ = 77728670732953 is a prime.

It is a super-2 number, since 2×77728670732969² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77728670732893 and 77728670732902.

It is not a weakly prime, because it can be changed into another prime (77728670732929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38864335366484 + 38864335366485.

It is an arithmetic number, because the mean of its divisors is an integer number (38864335366485).

Almost surely, 2^{77728670732969} is an apocalyptic number.

It is an amenable number.

77728670732969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77728670732969 is an equidigital number, since it uses as much as digits as its factorization.

77728670732969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704884352, while the sum is 80.

The spelling of 77728670732969 in words is "seventy-seven trillion, seven hundred twenty-eight billion, six hundred seventy million, seven hundred thirty-two thousand, nine hundred sixty-nine".