66643350 has 24 divisors (see below), whose sum is σ = 165275880. Its totient is φ = 17771520.

The previous prime is 66643337. The next prime is 66643361. The reversal of 66643350 is 5334666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221995 + ... + 222294.

It is an arithmetic number, because the mean of its divisors is an integer number (6886495).

Almost surely, 2^66643350 is an apocalyptic number.

66643350 is an abundant number, since it is smaller than the sum of its proper divisors (98632530).

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

66643350 is a wasteful number, since it uses less digits than its factorization.

66643350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444304 (or 444299 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 66643350 is about 8163.5378360120. The cubic root of 66643350 is about 405.4328553005.

The spelling of 66643350 in words is "sixty-six million, six hundred forty-three thousand, three hundred fifty".