663544378 has 12 divisors (see below), whose sum is σ = 1157817402. Its totient is φ = 284376120.

The previous prime is 663544373. The next prime is 663544379. The reversal of 663544378 is 873445366.

663544378 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., 383885649 + 279658729 = 19593^2 + 16723^2 .

It is a super-2 number, since 2×663544378² = 880582283150813768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663544373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3385333 + ... + 3385528.

Almost surely, 2^663544378 is an apocalyptic number.

663544378 is a deficient number, since it is larger than the sum of its proper divisors (494273024).

663544378 is a wasteful number, since it uses less digits than its factorization.

663544378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770877 (or 6770870 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The square root of 663544378 is about 25759.3551549723. The cubic root of 663544378 is about 872.2145449216.

The spelling of 663544378 in words is "six hundred sixty-three million, five hundred forty-four thousand, three hundred seventy-eight".