66368636 has 12 divisors (see below), whose sum is σ = 116459112. Its totient is φ = 33094608.

The previous prime is 66368633. The next prime is 66368641. The reversal of 66368636 is 63686366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66368633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20750 + ... + 23733.

It is an arithmetic number, because the mean of its divisors is an integer number (9704926).

Almost surely, 2^66368636 is an apocalyptic number.

It is an amenable number.

66368636 is a deficient number, since it is larger than the sum of its proper divisors (50090476).

66368636 is a wasteful number, since it uses less digits than its factorization.

66368636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44860 (or 44858 counting only the distinct ones).

The product of its digits is 559872, while the sum is 44.

The square root of 66368636 is about 8146.6947899133. The cubic root of 66368636 is about 404.8750028318.

The spelling of 66368636 in words is "sixty-six million, three hundred sixty-eight thousand, six hundred thirty-six".