6815212345 has 4 divisors (see below), whose sum is σ = 8178254820. Its totient is φ = 5452169872.

The previous prime is 6815212319. The next prime is 6815212403. The reversal of 6815212345 is 5432125186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 738698041 + 6076514304 = 27179^2 + 77952^2 .

It is a cyclic number.

It is not a de Polignac number, because 6815212345 - 2¹⁵ = 6815179577 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681521230 + ... + 681521239.

It is an arithmetic number, because the mean of its divisors is an integer number (2044563705).

Almost surely, 2^6815212345 is an apocalyptic number.

It is an amenable number.

6815212345 is a deficient number, since it is larger than the sum of its proper divisors (1363042475).

6815212345 is a wasteful number, since it uses less digits than its factorization.

6815212345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363042474.

The product of its digits is 57600, while the sum is 37.

The square root of 6815212345 is about 82554.2993732004. The cubic root of 6815212345 is about 1895.9481840636.

The spelling of 6815212345 in words is "six billion, eight hundred fifteen million, two hundred twelve thousand, three hundred forty-five".