6216020561 has 4 divisors (see below), whose sum is σ = 6216582000. Its totient is φ = 6215459124.

The previous prime is 6216020513. The next prime is 6216020593. The reversal of 6216020561 is 1650206126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6216020561 - 2²⁶ = 6148911697 is a prime.

It is a super-2 number, since 2×6216020561² = 77277823229549509442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6216020501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263771 + ... + 286368.

It is an arithmetic number, because the mean of its divisors is an integer number (1554145500).

Almost surely, 2^6216020561 is an apocalyptic number.

It is an amenable number.

6216020561 is a deficient number, since it is larger than the sum of its proper divisors (561439).

6216020561 is a wasteful number, since it uses less digits than its factorization.

6216020561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561438.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 6216020561 is about 78841.7437719385. The cubic root of 6216020561 is about 1838.6715128010.

Adding to 6216020561 its reverse (1650206126), we get a palindrome (7866226687).

The spelling of 6216020561 in words is "six billion, two hundred sixteen million, twenty thousand, five hundred sixty-one".