55666543 has 2 divisors, whose sum is σ = 55666544. Its totient is φ = 55666542.

The previous prime is 55666531. The next prime is 55666577. The reversal of 55666543 is 34566655.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55666543 - 2⁵ = 55666511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55666496 and 55666505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55666043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833271 + 27833272.

It is an arithmetic number, because the mean of its divisors is an integer number (27833272).

Almost surely, 2^55666543 is an apocalyptic number.

55666543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666543 is an equidigital number, since it uses as much as digits as its factorization.

55666543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 40.

The square root of 55666543 is about 7461.0014743331. The cubic root of 55666543 is about 381.8253429788.

The spelling of 55666543 in words is "fifty-five million, six hundred sixty-six thousand, five hundred forty-three".