663851946 has 32 divisors (see below), whose sum is σ = 1351687680. Its totient is φ = 217307376.

The previous prime is 663851941. The next prime is 663851971. The reversal of 663851946 is 649158366.

663851946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 663851895 and 663851904.

It is not an unprimeable number, because it can be changed into a prime (663851941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137115 + ... + 141873.

It is an arithmetic number, because the mean of its divisors is an integer number (42240240).

Almost surely, 2^663851946 is an apocalyptic number.

663851946 is an abundant number, since it is smaller than the sum of its proper divisors (687835734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663851946 is a wasteful number, since it uses less digits than its factorization.

663851946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178.

The product of its digits is 933120, while the sum is 48.

The square root of 663851946 is about 25765.3244885447. The cubic root of 663851946 is about 872.3492879037.

The spelling of 663851946 in words is "six hundred sixty-three million, eight hundred fifty-one thousand, nine hundred forty-six".