78593439643 has 2 divisors, whose sum is σ = 78593439644. Its totient is φ = 78593439642.

The previous prime is 78593439559. The next prime is 78593439707. The reversal of 78593439643 is 34693439587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78593439643 - 2⁹ = 78593439131 is a prime.

It is not a weakly prime, because it can be changed into another prime (78593419643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39296719821 + 39296719822.

It is an arithmetic number, because the mean of its divisors is an integer number (39296719822).

Almost surely, 2^78593439643 is an apocalyptic number.

78593439643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78593439643 is an equidigital number, since it uses as much as digits as its factorization.

78593439643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 61.

The spelling of 78593439643 in words is "seventy-eight billion, five hundred ninety-three million, four hundred thirty-nine thousand, six hundred forty-three".