78223572579 has 4 divisors (see below), whose sum is σ = 104298096776. Its totient is φ = 52149048384.

The previous prime is 78223572571. The next prime is 78223572599. The reversal of 78223572579 is 97527532287.

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

It is not a de Polignac number, because 78223572579 - 2³ = 78223572571 is a prime.

It is a super-2 number, since 2×78223572579² (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 (78223572571) 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, 13037262094 + ... + 13037262099.

It is an arithmetic number, because the mean of its divisors is an integer number (26074524194).

Almost surely, 2^78223572579 is an apocalyptic number.

78223572579 is a deficient number, since it is larger than the sum of its proper divisors (26074524197).

78223572579 is a wasteful number, since it uses less digits than its factorization.

78223572579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26074524196.

The product of its digits is 14817600, while the sum is 57.

The spelling of 78223572579 in words is "seventy-eight billion, two hundred twenty-three million, five hundred seventy-two thousand, five hundred seventy-nine".