51556663 has 2 divisors, whose sum is σ = 51556664. Its totient is φ = 51556662.

The previous prime is 51556643. The next prime is 51556667. The reversal of 51556663 is 36665515.

It is a happy number.

51556663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51556663 is a prime.

It is equal to p_3088828 and since 51556663 and 3088828 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51556667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778331 + 25778332.

It is an arithmetic number, because the mean of its divisors is an integer number (25778332).

Almost surely, 2^51556663 is an apocalyptic number.

51556663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51556663 is an equidigital number, since it uses as much as digits as its factorization.

51556663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 37.

The square root of 51556663 is about 7180.2968601584. The cubic root of 51556663 is about 372.1873430086.

The spelling of 51556663 in words is "fifty-one million, five hundred fifty-six thousand, six hundred sixty-three".