55206563 has 2 divisors, whose sum is σ = 55206564. Its totient is φ = 55206562.

The previous prime is 55206559. The next prime is 55206583. The reversal of 55206563 is 36560255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55206563 - 2² = 55206559 is a prime.

It is equal to p_3293825 and since 55206563 and 3293825 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55206523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27603281 + 27603282.

It is an arithmetic number, because the mean of its divisors is an integer number (27603282).

Almost surely, 2^55206563 is an apocalyptic number.

55206563 is a deficient number, since it is larger than the sum of its proper divisors (1).

55206563 is an equidigital number, since it uses as much as digits as its factorization.

55206563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 55206563 is about 7430.1119103281. Note that the first 3 decimals coincide. The cubic root of 55206563 is about 380.7707417666.

The spelling of 55206563 in words is "fifty-five million, two hundred six thousand, five hundred sixty-three".