78882218369 has 4 divisors (see below), whose sum is σ = 79070481840. Its totient is φ = 78693954900.

The previous prime is 78882218351. The next prime is 78882218407. The reversal of 78882218369 is 96381228887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96381228887 = 71 ⋅1357482097.

It is a cyclic number.

It is not a de Polignac number, because 78882218369 - 2²⁰ = 78881169793 is a prime.

It is a super-2 number, since 2×78882218369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78882518369) 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, 94131107 + ... + 94131944.

It is an arithmetic number, because the mean of its divisors is an integer number (19767620460).

Almost surely, 2^78882218369 is an apocalyptic number.

It is an amenable number.

78882218369 is a deficient number, since it is larger than the sum of its proper divisors (188263471).

78882218369 is a wasteful number, since it uses less digits than its factorization.

78882218369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188263470.

The product of its digits is 18579456, while the sum is 62.

The spelling of 78882218369 in words is "seventy-eight billion, eight hundred eighty-two million, two hundred eighteen thousand, three hundred sixty-nine".