451663 has 2 divisors, whose sum is σ = 451664. Its totient is φ = 451662.

The previous prime is 451657. The next prime is 451667. The reversal of 451663 is 366154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 451663 - 2¹⁷ = 320591 is a prime.

451663 is a lucky number.

It is equal to p₃₇₈₄₃ and since 451663 and 37843 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 (451667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225831 + 225832.

It is an arithmetic number, because the mean of its divisors is an integer number (225832).

2⁴⁵¹⁶⁶³ is an apocalyptic number.

451663 is a deficient number, since it is larger than the sum of its proper divisors (1).

451663 is an equidigital number, since it uses as much as digits as its factorization.

451663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 451663 is about 672.0587771914. The cubic root of 451663 is about 76.7252251625.

The spelling of 451663 in words is "four hundred fifty-one thousand, six hundred sixty-three".