78857183239 has 2 divisors, whose sum is σ = 78857183240. Its totient is φ = 78857183238.

The previous prime is 78857183173. The next prime is 78857183257. The reversal of 78857183239 is 93238175887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78857183239 - 2²¹ = 78855086087 is a prime.

It is a super-2 number, since 2×78857183239² (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 (78857183039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39428591619 + 39428591620.

It is an arithmetic number, because the mean of its divisors is an integer number (39428591620).

Almost surely, 2^78857183239 is an apocalyptic number.

78857183239 is a deficient number, since it is larger than the sum of its proper divisors (1).

78857183239 is an equidigital number, since it uses as much as digits as its factorization.

78857183239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 61.

The spelling of 78857183239 in words is "seventy-eight billion, eight hundred fifty-seven million, one hundred eighty-three thousand, two hundred thirty-nine".