77692769669 has 2 divisors, whose sum is σ = 77692769670. Its totient is φ = 77692769668.

The previous prime is 77692769639. The next prime is 77692769681. The reversal of 77692769669 is 96696729677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77400804100 + 291965569 = 278210^2 + 17087^2 .

It is an emirp because it is prime and its reverse (96696729677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77692769669 is a prime.

It is a super-2 number, since 2×77692769669² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77692769596 and 77692769605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77692769629) 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, 38846384834 + 38846384835.

It is an arithmetic number, because the mean of its divisors is an integer number (38846384835).

Almost surely, 2^77692769669 is an apocalyptic number.

It is an amenable number.

77692769669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77692769669 is an equidigital number, since it uses as much as digits as its factorization.

77692769669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648121824, while the sum is 74.

The spelling of 77692769669 in words is "seventy-seven billion, six hundred ninety-two million, seven hundred sixty-nine thousand, six hundred sixty-nine".