63686666 has 16 divisors (see below), whose sum is σ = 96690240. Its totient is φ = 31459200.

The previous prime is 63686659. The next prime is 63686669. The reversal of 63686666 is 66668636.

63686666 is a modest number, since divided by 6666 gives 6368 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 63686666.

It is not an unprimeable number, because it can be changed into a prime (63686669) 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, 68090 + ... + 69018.

It is an arithmetic number, because the mean of its divisors is an integer number (6043140).

Almost surely, 2^63686666 is an apocalyptic number.

63686666 is a deficient number, since it is larger than the sum of its proper divisors (33003574).

63686666 is a wasteful number, since it uses less digits than its factorization.

63686666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309.

The product of its digits is 1119744, while the sum is 47.

The square root of 63686666 is about 7980.3925968589. The cubic root of 63686666 is about 399.3461526247.

The spelling of 63686666 in words is "sixty-three million, six hundred eighty-six thousand, six hundred sixty-six".