3213256566 has 32 divisors (see below), whose sum is σ = 6959554560. Its totient is φ = 983166624.

The previous prime is 3213256531. The next prime is 3213256589. The reversal of 3213256566 is 6656523123.

It is a super-2 number, since 2×3213256566² = 20650035517884224712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101110 + ... + 129033.

It is an arithmetic number, because the mean of its divisors is an integer number (217486080).

Almost surely, 2^3213256566 is an apocalyptic number.

3213256566 is an abundant number, since it is smaller than the sum of its proper divisors (3746297994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3213256566 is a wasteful number, since it uses less digits than its factorization.

3213256566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230340.

The product of its digits is 194400, while the sum is 39.

The square root of 3213256566 is about 56685.5939900077. The cubic root of 3213256566 is about 1475.6446962069.

Adding to 3213256566 its reverse (6656523123), we get a palindrome (9869779689).

The spelling of 3213256566 in words is "three billion, two hundred thirteen million, two hundred fifty-six thousand, five hundred sixty-six".