55663213 has 2 divisors, whose sum is σ = 55663214. Its totient is φ = 55663212.

The previous prime is 55663193. The next prime is 55663229. The reversal of 55663213 is 31236655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53978409 + 1684804 = 7347^2 + 1298^2 .

It is a cyclic number.

It is not a de Polignac number, because 55663213 - 2¹³ = 55655021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55663813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27831606 + 27831607.

It is an arithmetic number, because the mean of its divisors is an integer number (27831607).

Almost surely, 2^55663213 is an apocalyptic number.

It is an amenable number.

55663213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55663213 is an equidigital number, since it uses as much as digits as its factorization.

55663213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 31.

The square root of 55663213 is about 7460.7783106054. The cubic root of 55663213 is about 381.8177291670.

Adding to 55663213 its reverse (31236655), we get a palindrome (86899868).

The spelling of 55663213 in words is "fifty-five million, six hundred sixty-three thousand, two hundred thirteen".