78381875839 has 2 divisors, whose sum is σ = 78381875840. Its totient is φ = 78381875838.

The previous prime is 78381875779. The next prime is 78381875857. The reversal of 78381875839 is 93857818387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78381875839 - 2²⁹ = 77845004927 is a prime.

It is a super-2 number, since 2×78381875839² (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 (78381875239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190937919 + 39190937920.

It is an arithmetic number, because the mean of its divisors is an integer number (39190937920).

Almost surely, 2^78381875839 is an apocalyptic number.

78381875839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78381875839 is an equidigital number, since it uses as much as digits as its factorization.

78381875839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81285120, while the sum is 67.

The spelling of 78381875839 in words is "seventy-eight billion, three hundred eighty-one million, eight hundred seventy-five thousand, eight hundred thirty-nine".