815642812247 has 8 divisors (see below), whose sum is σ = 845516069136. Its totient is φ = 786181600512.

The previous prime is 815642812217. The next prime is 815642812261. The reversal of 815642812247 is 742218246518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 815642812247 - 2²⁴ = 815626035031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 815642812195 and 815642812204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815642812217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103007258 + ... + 103015175.

It is an arithmetic number, because the mean of its divisors is an integer number (105689508642).

Almost surely, 2^815642812247 is an apocalyptic number.

815642812247 is a deficient number, since it is larger than the sum of its proper divisors (29873256889).

815642812247 is a wasteful number, since it uses less digits than its factorization.

815642812247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206022577.

The product of its digits is 1720320, while the sum is 50.

The spelling of 815642812247 in words is "eight hundred fifteen billion, six hundred forty-two million, eight hundred twelve thousand, two hundred forty-seven".