820108691315 has 4 divisors (see below), whose sum is σ = 984130429584. Its totient is φ = 656086953048.

The previous prime is 820108691309. The next prime is 820108691317. The reversal of 820108691315 is 513196801028.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820108691315 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820108691317) by changing a digit.

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, 82010869127 + ... + 82010869136.

It is an arithmetic number, because the mean of its divisors is an integer number (246032607396).

Almost surely, 2^820108691315 is an apocalyptic number.

820108691315 is a deficient number, since it is larger than the sum of its proper divisors (164021738269).

820108691315 is a wasteful number, since it uses less digits than its factorization.

820108691315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164021738268.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 820108691315 in words is "eight hundred twenty billion, one hundred eight million, six hundred ninety-one thousand, three hundred fifteen".