77964788653 has 2 divisors, whose sum is σ = 77964788654. Its totient is φ = 77964788652.

The previous prime is 77964788633. The next prime is 77964788813. The reversal of 77964788653 is 35688746977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69099059689 + 8865728964 = 262867^2 + 94158^2 .

It is a cyclic number.

It is not a de Polignac number, because 77964788653 - 2⁵ = 77964788621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77964788633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982394326 + 38982394327.

It is an arithmetic number, because the mean of its divisors is an integer number (38982394327).

Almost surely, 2^77964788653 is an apocalyptic number.

It is an amenable number.

77964788653 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964788653 is an equidigital number, since it uses as much as digits as its factorization.

77964788653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 426746880, while the sum is 70.

The spelling of 77964788653 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred eighty-eight thousand, six hundred fifty-three".