78918659 has 2 divisors, whose sum is σ = 78918660. Its totient is φ = 78918658.

The previous prime is 78918649. The next prime is 78918661. The reversal of 78918659 is 95681987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78918659 is a prime.

Together with 78918661, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78918659.

It is not a weakly prime, because it can be changed into another prime (78918629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39459329 + 39459330.

It is an arithmetic number, because the mean of its divisors is an integer number (39459330).

Almost surely, 2^78918659 is an apocalyptic number.

78918659 is a deficient number, since it is larger than the sum of its proper divisors (1).

78918659 is an equidigital number, since it uses as much as digits as its factorization.

78918659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 78918659 is about 8883.6174501157. The cubic root of 78918659 is about 428.9367257796.

The spelling of 78918659 in words is "seventy-eight million, nine hundred eighteen thousand, six hundred fifty-nine".