86378642939 has 2 divisors, whose sum is σ = 86378642940. Its totient is φ = 86378642938.

The previous prime is 86378642879. The next prime is 86378642953. The reversal of 86378642939 is 93924687368.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86378642939 is a prime.

It is a super-2 number, since 2×86378642939² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86378642969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43189321469 + 43189321470.

It is an arithmetic number, because the mean of its divisors is an integer number (43189321470).

Almost surely, 2^86378642939 is an apocalyptic number.

86378642939 is a deficient number, since it is larger than the sum of its proper divisors (1).

86378642939 is an equidigital number, since it uses as much as digits as its factorization.

86378642939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 65.

The spelling of 86378642939 in words is "eighty-six billion, three hundred seventy-eight million, six hundred forty-two thousand, nine hundred thirty-nine".