66633812 has 24 divisors (see below), whose sum is σ = 141107904. Its totient is φ = 26877312.

The previous prime is 66633739. The next prime is 66633857. The reversal of 66633812 is 21833666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69518 + ... + 70469.

It is an arithmetic number, because the mean of its divisors is an integer number (5879496).

Almost surely, 2^66633812 is an apocalyptic number.

It is an amenable number.

66633812 is an abundant number, since it is smaller than the sum of its proper divisors (74474092).

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

66633812 is a wasteful number, since it uses less digits than its factorization.

66633812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140015 (or 140013 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 66633812 is about 8162.9536321114. The cubic root of 66633812 is about 405.4135125200.

The spelling of 66633812 in words is "sixty-six million, six hundred thirty-three thousand, eight hundred twelve".