8213840397361 has 8 divisors (see below), whose sum is σ = 8222149923624. Its totient is φ = 8205531269760.

The previous prime is 8213840397331. The next prime is 8213840397379. The reversal of 8213840397361 is 1637930483128.

It can be written as a sum of positive squares in 4 ways, for example, as 496223033761 + 7717617363600 = 704431^2 + 2778060^2 .

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 8213840397361 - 2⁷ = 8213840397233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213840397331) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 58315941 + ... + 58456621.

It is an arithmetic number, because the mean of its divisors is an integer number (1027768740453).

Almost surely, 2^{8213840397361} is an apocalyptic number.

It is an amenable number.

8213840397361 is a deficient number, since it is larger than the sum of its proper divisors (8309526263).

8213840397361 is a wasteful number, since it uses less digits than its factorization.

8213840397361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199331.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 8213840397361 in words is "eight trillion, two hundred thirteen billion, eight hundred forty million, three hundred ninety-seven thousand, three hundred sixty-one".