78383796391 has 4 divisors (see below), whose sum is σ = 80912305984. Its totient is φ = 75855286800.

The previous prime is 78383796389. The next prime is 78383796397. The reversal of 78383796391 is 19369738387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78383796391 - 2¹ = 78383796389 is a prime.

It is a super-2 number, since 2×78383796391² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78383796397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264254750 + ... + 1264254811.

It is an arithmetic number, because the mean of its divisors is an integer number (20228076496).

Almost surely, 2^78383796391 is an apocalyptic number.

78383796391 is a deficient number, since it is larger than the sum of its proper divisors (2528509593).

78383796391 is a wasteful number, since it uses less digits than its factorization.

78383796391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528509592.

The product of its digits is 41150592, while the sum is 64.

The spelling of 78383796391 in words is "seventy-eight billion, three hundred eighty-three million, seven hundred ninety-six thousand, three hundred ninety-one".