212555663 has 2 divisors, whose sum is σ = 212555664. Its totient is φ = 212555662.

The previous prime is 212555657. The next prime is 212555677. The reversal of 212555663 is 366555212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212555663 - 2⁴ = 212555647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212555653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106277831 + 106277832.

It is an arithmetic number, because the mean of its divisors is an integer number (106277832).

Almost surely, 2^212555663 is an apocalyptic number.

212555663 is a deficient number, since it is larger than the sum of its proper divisors (1).

212555663 is an equidigital number, since it uses as much as digits as its factorization.

212555663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 35.

The square root of 212555663 is about 14579.2888372513. The cubic root of 212555663 is about 596.7936956148.

The spelling of 212555663 in words is "two hundred twelve million, five hundred fifty-five thousand, six hundred sixty-three".