55817563 has 2 divisors, whose sum is σ = 55817564. Its totient is φ = 55817562.

The previous prime is 55817561. The next prime is 55817581. The reversal of 55817563 is 36571855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55817563 - 2¹ = 55817561 is a prime.

Together with 55817561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55817561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27908781 + 27908782.

It is an arithmetic number, because the mean of its divisors is an integer number (27908782).

Almost surely, 2^55817563 is an apocalyptic number.

55817563 is a deficient number, since it is larger than the sum of its proper divisors (1).

55817563 is an equidigital number, since it uses as much as digits as its factorization.

55817563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 40.

The square root of 55817563 is about 7471.1152447275. The cubic root of 55817563 is about 382.1703209673.

The spelling of 55817563 in words is "fifty-five million, eight hundred seventeen thousand, five hundred sixty-three".