55640033 has 2 divisors, whose sum is σ = 55640034. Its totient is φ = 55640032.

The previous prime is 55639981. The next prime is 55640047. The reversal of 55640033 is 33004655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 1940449 = 7328^2 + 1393^2 .

It is a cyclic number.

It is not a de Polignac number, because 55640033 - 2²² = 51445729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55639984 and 55640011.

It is not a weakly prime, because it can be changed into another prime (55640063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27820016 + 27820017.

It is an arithmetic number, because the mean of its divisors is an integer number (27820017).

Almost surely, 2^55640033 is an apocalyptic number.

It is an amenable number.

55640033 is a deficient number, since it is larger than the sum of its proper divisors (1).

55640033 is an equidigital number, since it uses as much as digits as its factorization.

55640033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 55640033 is about 7459.2246916151. The cubic root of 55640033 is about 381.7647213046.

Adding to 55640033 its reverse (33004655), we get a palindrome (88644688).

The spelling of 55640033 in words is "fifty-five million, six hundred forty thousand, thirty-three".