663665061 has 8 divisors (see below), whose sum is σ = 886232160. Its totient is φ = 441770672.

The previous prime is 663665059. The next prime is 663665089. The reversal of 663665061 is 160566366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663665061 - 2¹ = 663665059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663665011) 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 in 7 ways as a sum of consecutive naturals, for example, 165870 + ... + 169823.

It is an arithmetic number, because the mean of its divisors is an integer number (110779020).

Almost surely, 2^663665061 is an apocalyptic number.

It is an amenable number.

663665061 is a deficient number, since it is larger than the sum of its proper divisors (222567099).

663665061 is a wasteful number, since it uses less digits than its factorization.

663665061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336355.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 663665061 is about 25761.6975566440. The cubic root of 663665061 is about 872.2674201024.

The spelling of 663665061 in words is "six hundred sixty-three million, six hundred sixty-five thousand, sixty-one".