77989810823 has 2 divisors, whose sum is σ = 77989810824. Its totient is φ = 77989810822.

The previous prime is 77989810813. The next prime is 77989810831. The reversal of 77989810823 is 32801898977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77989810823 - 2¹⁶ = 77989745287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77989810813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38994905411 + 38994905412.

It is an arithmetic number, because the mean of its divisors is an integer number (38994905412).

Almost surely, 2^77989810823 is an apocalyptic number.

77989810823 is a deficient number, since it is larger than the sum of its proper divisors (1).

77989810823 is an equidigital number, since it uses as much as digits as its factorization.

77989810823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 62.

The spelling of 77989810823 in words is "seventy-seven billion, nine hundred eighty-nine million, eight hundred ten thousand, eight hundred twenty-three".