78194782079 has 2 divisors, whose sum is σ = 78194782080. Its totient is φ = 78194782078.

The previous prime is 78194782067. The next prime is 78194782097. The reversal of 78194782079 is 97028749187.

Together with next prime (78194782097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78194782079 is a prime.

It is a super-2 number, since 2×78194782079² (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 (78194782009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39097391039 + 39097391040.

It is an arithmetic number, because the mean of its divisors is an integer number (39097391040).

Almost surely, 2^78194782079 is an apocalyptic number.

78194782079 is a deficient number, since it is larger than the sum of its proper divisors (1).

78194782079 is an equidigital number, since it uses as much as digits as its factorization.

78194782079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 78194782079 in words is "seventy-eight billion, one hundred ninety-four million, seven hundred eighty-two thousand, seventy-nine".