63666393 has 16 divisors (see below), whose sum is σ = 97760256. Its totient is φ = 36101520.

The previous prime is 63666389. The next prime is 63666403. The reversal of 63666393 is 39366636.

It is not a de Polignac number, because 63666393 - 2² = 63666389 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63666593) 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, 8821 + ... + 14322.

It is an arithmetic number, because the mean of its divisors is an integer number (6110016).

Almost surely, 2^63666393 is an apocalyptic number.

It is an amenable number.

63666393 is a deficient number, since it is larger than the sum of its proper divisors (34093863).

63666393 is a wasteful number, since it uses less digits than its factorization.

63666393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23284.

The product of its digits is 314928, while the sum is 42.

The square root of 63666393 is about 7979.1223201553. The cubic root of 63666393 is about 399.3037742942.

It can be divided in two parts, 636663 and 93, that added together give a triangular number (636756 = T₁₁₂₈).

The spelling of 63666393 in words is "sixty-three million, six hundred sixty-six thousand, three hundred ninety-three".