63666636 has 24 divisors (see below), whose sum is σ = 162060864. Its totient is φ = 19292880.

The previous prime is 63666619. The next prime is 63666637.

63666636 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (63666637) 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, 241030 + ... + 241293.

It is an arithmetic number, because the mean of its divisors is an integer number (6752536).

Almost surely, 2^63666636 is an apocalyptic number.

63666636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

63666636 is an abundant number, since it is smaller than the sum of its proper divisors (98394228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63666636 is a wasteful number, since it uses less digits than its factorization.

63666636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482341 (or 482339 counting only the distinct ones).

The product of its digits is 419904, while the sum is 42.

The square root of 63666636 is about 7979.1375473794. The cubic root of 63666636 is about 399.3042823105.

The spelling of 63666636 in words is "sixty-three million, six hundred sixty-six thousand, six hundred thirty-six".