78324747099 has 4 divisors (see below), whose sum is σ = 104432996136. Its totient is φ = 52216498064.

The previous prime is 78324747089. The next prime is 78324747103. The reversal of 78324747099 is 99074742387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99074742387 = 3 ⋅33024914129.

It is a cyclic number.

It is not a de Polignac number, because 78324747099 - 2¹⁶ = 78324681563 is a prime.

It is a super-2 number, since 2×78324747099² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78324747089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13054124514 + ... + 13054124519.

It is an arithmetic number, because the mean of its divisors is an integer number (26108249034).

Almost surely, 2^78324747099 is an apocalyptic number.

78324747099 is a deficient number, since it is larger than the sum of its proper divisors (26108249037).

78324747099 is a wasteful number, since it uses less digits than its factorization.

78324747099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26108249036.

The product of its (nonzero) digits is 21337344, while the sum is 60.

The spelling of 78324747099 in words is "seventy-eight billion, three hundred twenty-four million, seven hundred forty-seven thousand, ninety-nine".