55566869 has 2 divisors, whose sum is σ = 55566870. Its totient is φ = 55566868.

The previous prime is 55566857. The next prime is 55566983. The reversal of 55566869 is 96866555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32890225 + 22676644 = 5735^2 + 4762^2 .

It is a cyclic number.

It is not a de Polignac number, because 55566869 - 2¹⁶ = 55501333 is a prime.

It is a super-2 number, since 2×55566869² = 6175353860926322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55566809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27783434 + 27783435.

It is an arithmetic number, because the mean of its divisors is an integer number (27783435).

Almost surely, 2^55566869 is an apocalyptic number.

It is an amenable number.

55566869 is a deficient number, since it is larger than the sum of its proper divisors (1).

55566869 is an equidigital number, since it uses as much as digits as its factorization.

55566869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 50.

The square root of 55566869 is about 7454.3188152909. The cubic root of 55566869 is about 381.5973137484.

The spelling of 55566869 in words is "fifty-five million, five hundred sixty-six thousand, eight hundred sixty-nine".