77964236797 has 2 divisors, whose sum is σ = 77964236798. Its totient is φ = 77964236796.

The previous prime is 77964236747. The next prime is 77964236827. The reversal of 77964236797 is 79763246977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73624852921 + 4339383876 = 271339^2 + 65874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77964236797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77964236717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982118398 + 38982118399.

It is an arithmetic number, because the mean of its divisors is an integer number (38982118399).

Almost surely, 2^77964236797 is an apocalyptic number.

It is an amenable number.

77964236797 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964236797 is an equidigital number, since it uses as much as digits as its factorization.

77964236797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168031584, while the sum is 67.

The spelling of 77964236797 in words is "seventy-seven billion, nine hundred sixty-four million, two hundred thirty-six thousand, seven hundred ninety-seven".