6216346661 has 4 divisors (see below), whose sum is σ = 7104396192. Its totient is φ = 5328297132.

The previous prime is 6216346639. The next prime is 6216346673. The reversal of 6216346661 is 1666436126.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1666436126 = 2 ⋅833218063.

It is a cyclic number.

It is not a de Polignac number, because 6216346661 - 2³⁰ = 5142604837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6216346681) 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, 444024755 + ... + 444024768.

It is an arithmetic number, because the mean of its divisors is an integer number (1776099048).

Almost surely, 2^6216346661 is an apocalyptic number.

It is an amenable number.

6216346661 is a deficient number, since it is larger than the sum of its proper divisors (888049531).

6216346661 is an equidigital number, since it uses as much as digits as its factorization.

6216346661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888049530.

The product of its digits is 186624, while the sum is 41.

The square root of 6216346661 is about 78843.8118117078. The cubic root of 6216346661 is about 1838.7036652201.

The spelling of 6216346661 in words is "six billion, two hundred sixteen million, three hundred forty-six thousand, six hundred sixty-one".