66733656 has 32 divisors (see below), whose sum is σ = 182001600. Its totient is φ = 20222240.

The previous prime is 66733651. The next prime is 66733657. The reversal of 66733656 is 65633766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733651) 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, 126126 + ... + 126653.

It is an arithmetic number, because the mean of its divisors is an integer number (5687550).

Almost surely, 2^66733656 is an apocalyptic number.

66733656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66733656 is an abundant number, since it is smaller than the sum of its proper divisors (115267944).

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

66733656 is a wasteful number, since it uses less digits than its factorization.

66733656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252799 (or 252795 counting only the distinct ones).

The product of its digits is 408240, while the sum is 42.

The square root of 66733656 is about 8169.0670213923. The cubic root of 66733656 is about 405.6159017920.

The spelling of 66733656 in words is "sixty-six million, seven hundred thirty-three thousand, six hundred fifty-six".