78329347999 has 16 divisors (see below), whose sum is σ = 90422931456. Its totient is φ = 66461940000.

The previous prime is 78329347981. The next prime is 78329348003. The reversal of 78329347999 is 99974392387.

It is a cyclic number.

It is not a de Polignac number, because 78329347999 - 2⁹ = 78329347487 is a prime.

It is a super-2 number, since 2×78329347999² (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 (78329347919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6463704 + ... + 6475810.

It is an arithmetic number, because the mean of its divisors is an integer number (5651433216).

Almost surely, 2^78329347999 is an apocalyptic number.

78329347999 is a deficient number, since it is larger than the sum of its proper divisors (12093583457).

78329347999 is a wasteful number, since it uses less digits than its factorization.

78329347999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21366.

The product of its digits is 185177664, while the sum is 70.

The spelling of 78329347999 in words is "seventy-eight billion, three hundred twenty-nine million, three hundred forty-seven thousand, nine hundred ninety-nine".