663212061 has 18 divisors (see below), whose sum is σ = 1001442078. Its totient is φ = 422914800.

The previous prime is 663212059. The next prime is 663212089. The reversal of 663212061 is 160212366.

663212061 is a `hidden beast` number, since 6 + 632 + 1 + 20 + 6 + 1 = 666.

663212061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 651780900 + 11431161 = 25530^2 + 3381^2 .

It is not a de Polignac number, because 663212061 - 2¹ = 663212059 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663212021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 64890 + ... + 74411.

It is an arithmetic number, because the mean of its divisors is an integer number (55635671).

Almost surely, 2^663212061 is an apocalyptic number.

It is an amenable number.

663212061 is a deficient number, since it is larger than the sum of its proper divisors (338230017).

663212061 is a wasteful number, since it uses less digits than its factorization.

663212061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139353 (or 139327 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 663212061 is about 25752.9039333431. The cubic root of 663212061 is about 872.0689128021.

The spelling of 663212061 in words is "six hundred sixty-three million, two hundred twelve thousand, sixty-one".