77665224513991 has 2 divisors, whose sum is σ = 77665224513992. Its totient is φ = 77665224513990.

The previous prime is 77665224513931. The next prime is 77665224514027. The reversal of 77665224513991 is 19931542256677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77665224513991 - 2²¹ = 77665222416839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77665224513931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38832612256995 + 38832612256996.

It is an arithmetic number, because the mean of its divisors is an integer number (38832612256996).

Almost surely, 2^{77665224513991} is an apocalyptic number.

77665224513991 is a deficient number, since it is larger than the sum of its proper divisors (1).

77665224513991 is an equidigital number, since it uses as much as digits as its factorization.

77665224513991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 171460800, while the sum is 67.

The spelling of 77665224513991 in words is "seventy-seven trillion, six hundred sixty-five billion, two hundred twenty-four million, five hundred thirteen thousand, nine hundred ninety-one".