3213633661 has 4 divisors (see below), whose sum is σ = 3672724192. Its totient is φ = 2754543132.

The previous prime is 3213633581. The next prime is 3213633671. The reversal of 3213633661 is 1663363123.

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 3213633661 - 2⁹ = 3213633149 is a prime.

It is a super-2 number, since 2×3213633661² = 20654882614224525842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213633671) 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, 229545255 + ... + 229545268.

It is an arithmetic number, because the mean of its divisors is an integer number (918181048).

Almost surely, 2^3213633661 is an apocalyptic number.

It is an amenable number.

3213633661 is a deficient number, since it is larger than the sum of its proper divisors (459090531).

3213633661 is an equidigital number, since it uses as much as digits as its factorization.

3213633661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459090530.

The product of its digits is 34992, while the sum is 34.

The square root of 3213633661 is about 56688.9200902610. The cubic root of 3213633661 is about 1475.7024192114.

Adding to 3213633661 its reverse (1663363123), we get a palindrome (4876996784).

The spelling of 3213633661 in words is "three billion, two hundred thirteen million, six hundred thirty-three thousand, six hundred sixty-one".