77661497983 has 2 divisors, whose sum is σ = 77661497984. Its totient is φ = 77661497982.

The previous prime is 77661497929. The next prime is 77661497993. The reversal of 77661497983 is 38979416677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77661497983 - 2⁹ = 77661497471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77661497993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38830748991 + 38830748992.

It is an arithmetic number, because the mean of its divisors is an integer number (38830748992).

Almost surely, 2^77661497983 is an apocalyptic number.

77661497983 is a deficient number, since it is larger than the sum of its proper divisors (1).

77661497983 is an equidigital number, since it uses as much as digits as its factorization.

77661497983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96018048, while the sum is 67.

The spelling of 77661497983 in words is "seventy-seven billion, six hundred sixty-one million, four hundred ninety-seven thousand, nine hundred eighty-three".