78616664479 has 2 divisors, whose sum is σ = 78616664480. Its totient is φ = 78616664478.

The previous prime is 78616664471. The next prime is 78616664513. The reversal of 78616664479 is 97446661687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78616664479 - 2³ = 78616664471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78616664479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78616664471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39308332239 + 39308332240.

It is an arithmetic number, because the mean of its divisors is an integer number (39308332240).

Almost surely, 2^78616664479 is an apocalyptic number.

78616664479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78616664479 is an equidigital number, since it uses as much as digits as its factorization.

78616664479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 64.

The spelling of 78616664479 in words is "seventy-eight billion, six hundred sixteen million, six hundred sixty-four thousand, four hundred seventy-nine".