63866661 has 8 divisors (see below), whose sum is σ = 85255104. Its totient is φ = 42528000.

The previous prime is 63866659. The next prime is 63866689. The reversal of 63866661 is 16666836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63866661 - 2¹ = 63866659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63866461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9340 + ... + 14661.

It is an arithmetic number, because the mean of its divisors is an integer number (10656888).

Almost surely, 2^63866661 is an apocalyptic number.

It is an amenable number.

63866661 is a deficient number, since it is larger than the sum of its proper divisors (21388443).

63866661 is a wasteful number, since it uses less digits than its factorization.

63866661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24891.

The product of its digits is 186624, while the sum is 42.

The square root of 63866661 is about 7991.6619673257. The cubic root of 63866661 is about 399.7220172754.

The spelling of 63866661 in words is "sixty-three million, eight hundred sixty-six thousand, six hundred sixty-one".