78643579319 has 2 divisors, whose sum is σ = 78643579320. Its totient is φ = 78643579318.

The previous prime is 78643579297. The next prime is 78643579349. The reversal of 78643579319 is 91397534687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78643579319 - 2²⁸ = 78375143863 is a prime.

It is a super-2 number, since 2×78643579319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78643579349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321789659 + 39321789660.

It is an arithmetic number, because the mean of its divisors is an integer number (39321789660).

Almost surely, 2^78643579319 is an apocalyptic number.

78643579319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78643579319 is an equidigital number, since it uses as much as digits as its factorization.

78643579319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 62.

The spelling of 78643579319 in words is "seventy-eight billion, six hundred forty-three million, five hundred seventy-nine thousand, three hundred nineteen".