55566311 has 2 divisors, whose sum is σ = 55566312. Its totient is φ = 55566310.

The previous prime is 55566299. The next prime is 55566373. The reversal of 55566311 is 11366555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55566311 - 2²² = 51372007 is a prime.

It is a super-2 number, since 2×55566311² = 6175229836297442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55566391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27783155 + 27783156.

It is an arithmetic number, because the mean of its divisors is an integer number (27783156).

Almost surely, 2^55566311 is an apocalyptic number.

55566311 is a deficient number, since it is larger than the sum of its proper divisors (1).

55566311 is an equidigital number, since it uses as much as digits as its factorization.

55566311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13500, while the sum is 32.

The square root of 55566311 is about 7454.2813872298. The cubic root of 55566311 is about 381.5960364165.

It can be divided in two parts, 555 and 66311, that added together give a palindrome (66866).

The spelling of 55566311 in words is "fifty-five million, five hundred sixty-six thousand, three hundred eleven".