663659401 has 2 divisors, whose sum is σ = 663659402. Its totient is φ = 663659400.

The previous prime is 663659387. The next prime is 663659419. The reversal of 663659401 is 104956366.

663659401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640849225 + 22810176 = 25315^2 + 4776^2 .

It is a cyclic number.

It is not a de Polignac number, because 663659401 - 2¹⁷ = 663528329 is a prime.

It is not a weakly prime, because it can be changed into another prime (663659431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331829700 + 331829701.

It is an arithmetic number, because the mean of its divisors is an integer number (331829701).

Almost surely, 2^663659401 is an apocalyptic number.

It is an amenable number.

663659401 is a deficient number, since it is larger than the sum of its proper divisors (1).

663659401 is an equidigital number, since it uses as much as digits as its factorization.

663659401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 663659401 is about 25761.5877034006. The cubic root of 663659401 is about 872.2649404141.

The spelling of 663659401 in words is "six hundred sixty-three million, six hundred fifty-nine thousand, four hundred one".