78394603699 has 4 divisors (see below), whose sum is σ = 78402581280. Its totient is φ = 78386626120.

The previous prime is 78394603697. The next prime is 78394603739. The reversal of 78394603699 is 99630649387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99630649387 = 108271 ⋅920197.

It is a cyclic number.

It is not a de Polignac number, because 78394603699 - 2¹ = 78394603697 is a prime.

It is a super-2 number, since 2×78394603699² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78394603699.

It is not an unprimeable number, because it can be changed into a prime (78394603691) 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 in 3 ways as a sum of consecutive naturals, for example, 3974032 + ... + 3993709.

It is an arithmetic number, because the mean of its divisors is an integer number (19600645320).

Almost surely, 2^78394603699 is an apocalyptic number.

78394603699 is a deficient number, since it is larger than the sum of its proper divisors (7977581).

78394603699 is an equidigital number, since it uses as much as digits as its factorization.

78394603699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977580.

The product of its (nonzero) digits is 52907904, while the sum is 64.

The spelling of 78394603699 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred ninety-nine".