55666427 has 2 divisors, whose sum is σ = 55666428. Its totient is φ = 55666426.

The previous prime is 55666393. The next prime is 55666433. The reversal of 55666427 is 72466655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55666427 - 2²² = 51472123 is a prime.

It is not a weakly prime, because it can be changed into another prime (55666727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833213 + 27833214.

It is an arithmetic number, because the mean of its divisors is an integer number (27833214).

Almost surely, 2^55666427 is an apocalyptic number.

55666427 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666427 is an equidigital number, since it uses as much as digits as its factorization.

55666427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 55666427 is about 7460.9937005737. The cubic root of 55666427 is about 381.8250777580.

The spelling of 55666427 in words is "fifty-five million, six hundred sixty-six thousand, four hundred twenty-seven".