78699397739 has 2 divisors, whose sum is σ = 78699397740. Its totient is φ = 78699397738.

The previous prime is 78699397681. The next prime is 78699397747. The reversal of 78699397739 is 93779399687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78699397739 - 2¹⁶ = 78699332203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78699397739.

It is not a weakly prime, because it can be changed into another prime (78699390739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39349698869 + 39349698870.

It is an arithmetic number, because the mean of its divisors is an integer number (39349698870).

Almost surely, 2^78699397739 is an apocalyptic number.

78699397739 is a deficient number, since it is larger than the sum of its proper divisors (1).

78699397739 is an equidigital number, since it uses as much as digits as its factorization.

78699397739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972182736, while the sum is 77.

The spelling of 78699397739 in words is "seventy-eight billion, six hundred ninety-nine million, three hundred ninety-seven thousand, seven hundred thirty-nine".