3216565561 has 8 divisors (see below), whose sum is σ = 3509408448. Its totient is φ = 2923794000.

The previous prime is 3216565559. The next prime is 3216565567. The reversal of 3216565561 is 1655656123.

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 3216565561 - 2¹ = 3216565559 is a prime.

It is a super-2 number, since 2×3216565561² = 20692588016422489442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216565567) 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, 129271 + ... + 152131.

It is an arithmetic number, because the mean of its divisors is an integer number (438676056).

Almost surely, 2^3216565561 is an apocalyptic number.

It is an amenable number.

3216565561 is a deficient number, since it is larger than the sum of its proper divisors (292842887).

3216565561 is a wasteful number, since it uses less digits than its factorization.

3216565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35663.

The product of its digits is 162000, while the sum is 40.

The square root of 3216565561 is about 56714.7737454713. The cubic root of 3216565561 is about 1476.1510595230.

The spelling of 3216565561 in words is "three billion, two hundred sixteen million, five hundred sixty-five thousand, five hundred sixty-one".