63666893 has 4 divisors (see below), whose sum is σ = 64434048. Its totient is φ = 62899740.

The previous prime is 63666881. The next prime is 63666937. The reversal of 63666893 is 39866636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63666893 - 2⁸ = 63666637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63666593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383453 + ... + 383618.

It is an arithmetic number, because the mean of its divisors is an integer number (16108512).

Almost surely, 2^63666893 is an apocalyptic number.

It is an amenable number.

63666893 is a deficient number, since it is larger than the sum of its proper divisors (767155).

63666893 is an equidigital number, since it uses as much as digits as its factorization.

63666893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767154.

The product of its digits is 839808, while the sum is 47.

The square root of 63666893 is about 7979.1536518606. The cubic root of 63666893 is about 399.3048195938.

The spelling of 63666893 in words is "sixty-three million, six hundred sixty-six thousand, eight hundred ninety-three".