8216561713 has 8 divisors (see below), whose sum is σ = 8372320040. Its totient is φ = 8061482880.

The previous prime is 8216561707. The next prime is 8216561719. The reversal of 8216561713 is 3171656128.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8216561707) and next prime (8216561719).

It can be written as a sum of positive squares in 4 ways, for example, as 28483569 + 8188078144 = 5337^2 + 90488^2 .

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 8216561713 - 2²¹ = 8214464561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8216561719) 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, 145428 + ... + 193861.

It is an arithmetic number, because the mean of its divisors is an integer number (1046540005).

Almost surely, 2^8216561713 is an apocalyptic number.

It is an amenable number.

8216561713 is a deficient number, since it is larger than the sum of its proper divisors (155758327).

8216561713 is a wasteful number, since it uses less digits than its factorization.

8216561713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339747.

The product of its digits is 60480, while the sum is 40.

The square root of 8216561713 is about 90645.2520157565. The cubic root of 8216561713 is about 2017.8863714213.

The spelling of 8216561713 in words is "eight billion, two hundred sixteen million, five hundred sixty-one thousand, seven hundred thirteen".