402661663 has 2 divisors, whose sum is σ = 402661664. Its totient is φ = 402661662.

The previous prime is 402661619. The next prime is 402661669. The reversal of 402661663 is 366166204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402661663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402661669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201330831 + 201330832.

It is an arithmetic number, because the mean of its divisors is an integer number (201330832).

Almost surely, 2^402661663 is an apocalyptic number.

402661663 is a deficient number, since it is larger than the sum of its proper divisors (1).

402661663 is an equidigital number, since it uses as much as digits as its factorization.

402661663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 402661663 is about 20066.4312472348. The cubic root of 402661663 is about 738.4369632166.

The spelling of 402661663 in words is "four hundred two million, six hundred sixty-one thousand, six hundred sixty-three".