78734118839 has 2 divisors, whose sum is σ = 78734118840. Its totient is φ = 78734118838.

The previous prime is 78734118739. The next prime is 78734118847. The reversal of 78734118839 is 93881143787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78734118839 - 2⁸ = 78734118583 is a prime.

It is a super-2 number, since 2×78734118839² (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 (78734118899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367059419 + 39367059420.

It is an arithmetic number, because the mean of its divisors is an integer number (39367059420).

Almost surely, 2^78734118839 is an apocalyptic number.

78734118839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734118839 is an equidigital number, since it uses as much as digits as its factorization.

78734118839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 59.

The spelling of 78734118839 in words is "seventy-eight billion, seven hundred thirty-four million, one hundred eighteen thousand, eight hundred thirty-nine".