66636636 has 36 divisors (see below), whose sum is σ = 170909256. Its totient is φ = 20192480.

The previous prime is 66636631. The next prime is 66636641. The reversal of 66636636 is 63663666.

It is an interprime number because it is at equal distance from previous prime (66636631) and next prime (66636641).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66636631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21495 + ... + 24398.

Almost surely, 2^66636636 is an apocalyptic number.

66636636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66636636 is an abundant number, since it is smaller than the sum of its proper divisors (104272620).

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

66636636 is a wasteful number, since it uses less digits than its factorization.

66636636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45922 (or 45909 counting only the distinct ones).

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

The square root of 66636636 is about 8163.1266068829. The cubic root of 66636636 is about 405.4192397004.

The spelling of 66636636 in words is "sixty-six million, six hundred thirty-six thousand, six hundred thirty-six".