663655043 has 2 divisors, whose sum is σ = 663655044. Its totient is φ = 663655042.

The previous prime is 663655021. The next prime is 663655067. The reversal of 663655043 is 340556366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663655043 - 2¹⁴ = 663638659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663654988 and 663655006.

It is not a weakly prime, because it can be changed into another prime (663655243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331827521 + 331827522.

It is an arithmetic number, because the mean of its divisors is an integer number (331827522).

Almost surely, 2^663655043 is an apocalyptic number.

663655043 is a deficient number, since it is larger than the sum of its proper divisors (1).

663655043 is an equidigital number, since it uses as much as digits as its factorization.

663655043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 663655043 is about 25761.5031199657. The cubic root of 663655043 is about 872.2630311320.

The spelling of 663655043 in words is "six hundred sixty-three million, six hundred fifty-five thousand, forty-three".