78765080729 has 2 divisors, whose sum is σ = 78765080730. Its totient is φ = 78765080728.

The previous prime is 78765080699. The next prime is 78765080809. The reversal of 78765080729 is 92708056787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64326655129 + 14438425600 = 253627^2 + 120160^2 .

It is a cyclic number.

It is not a de Polignac number, because 78765080729 - 2¹² = 78765076633 is a prime.

It is not a weakly prime, because it can be changed into another prime (78765010729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39382540364 + 39382540365.

It is an arithmetic number, because the mean of its divisors is an integer number (39382540365).

Almost surely, 2^78765080729 is an apocalyptic number.

It is an amenable number.

78765080729 is a deficient number, since it is larger than the sum of its proper divisors (1).

78765080729 is an equidigital number, since it uses as much as digits as its factorization.

78765080729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11854080, while the sum is 59.

The spelling of 78765080729 in words is "seventy-eight billion, seven hundred sixty-five million, eighty thousand, seven hundred twenty-nine".