78193839187 has 2 divisors, whose sum is σ = 78193839188. Its totient is φ = 78193839186.

The previous prime is 78193839181. The next prime is 78193839223.

78193839187 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78193839187 is a prime.

It is a super-2 number, since 2×78193839187² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78193839181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39096919593 + 39096919594.

It is an arithmetic number, because the mean of its divisors is an integer number (39096919594).

Almost surely, 2^78193839187 is an apocalyptic number.

78193839187 is a deficient number, since it is larger than the sum of its proper divisors (1).

78193839187 is an equidigital number, since it uses as much as digits as its factorization.

78193839187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 64.

The spelling of 78193839187 in words is "seventy-eight billion, one hundred ninety-three million, eight hundred thirty-nine thousand, one hundred eighty-seven".