56661233 has 2 divisors, whose sum is σ = 56661234. Its totient is φ = 56661232.

The previous prime is 56661217. The next prime is 56661239. The reversal of 56661233 is 33216665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47100769 + 9560464 = 6863^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 56661233 - 2⁴ = 56661217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56661233.

It is not a weakly prime, because it can be changed into another prime (56661239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28330616 + 28330617.

It is an arithmetic number, because the mean of its divisors is an integer number (28330617).

Almost surely, 2^56661233 is an apocalyptic number.

It is an amenable number.

56661233 is a deficient number, since it is larger than the sum of its proper divisors (1).

56661233 is an equidigital number, since it uses as much as digits as its factorization.

56661233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 56661233 is about 7527.3656082324. The cubic root of 56661233 is about 384.0861736037.

Adding to 56661233 its reverse (33216665), we get a palindrome (89877898).

The spelling of 56661233 in words is "fifty-six million, six hundred sixty-one thousand, two hundred thirty-three".