78579357215 has 4 divisors (see below), whose sum is σ = 94295228664. Its totient is φ = 62863485768.

The previous prime is 78579357211. The next prime is 78579357247. The reversal of 78579357215 is 51275397587.

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 78579357215 - 2² = 78579357211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78579357211) 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, 7857935717 + ... + 7857935726.

It is an arithmetic number, because the mean of its divisors is an integer number (23573807166).

Almost surely, 2^78579357215 is an apocalyptic number.

78579357215 is a deficient number, since it is larger than the sum of its proper divisors (15715871449).

78579357215 is a wasteful number, since it uses less digits than its factorization.

78579357215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15715871448.

The product of its digits is 18522000, while the sum is 59.

The spelling of 78579357215 in words is "seventy-eight billion, five hundred seventy-nine million, three hundred fifty-seven thousand, two hundred fifteen".