663140406 has 64 divisors (see below), whose sum is σ = 1403781120. Its totient is φ = 208565280.

The previous prime is 663140389. The next prime is 663140407. The reversal of 663140406 is 604041366.

663140406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663140407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1582465 + ... + 1582883.

It is an arithmetic number, because the mean of its divisors is an integer number (21934080).

Almost surely, 2^663140406 is an apocalyptic number.

663140406 is an abundant number, since it is smaller than the sum of its proper divisors (740640714).

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

663140406 is a wasteful number, since it uses less digits than its factorization.

663140406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 663140406 is about 25751.5126934322. The cubic root of 663140406 is about 872.0375048748.

The spelling of 663140406 in words is "six hundred sixty-three million, one hundred forty thousand, four hundred six".