816515217386 has 8 divisors (see below), whose sum is σ = 1336115810304. Its totient is φ = 371143280620.

The previous prime is 816515217361. The next prime is 816515217403. The reversal of 816515217386 is 683712515618.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18557164010 + ... + 18557164053.

It is an arithmetic number, because the mean of its divisors is an integer number (167014476288).

Almost surely, 2^816515217386 is an apocalyptic number.

816515217386 is a deficient number, since it is larger than the sum of its proper divisors (519600592918).

816515217386 is a wasteful number, since it uses less digits than its factorization.

816515217386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37114328076.

The product of its digits is 2419200, while the sum is 53.

The spelling of 816515217386 in words is "eight hundred sixteen billion, five hundred fifteen million, two hundred seventeen thousand, three hundred eighty-six".