66664600 has 24 divisors (see below), whose sum is σ = 154995660. Its totient is φ = 26665760.

The previous prime is 66664589. The next prime is 66664607. The reversal of 66664600 is 646666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166462 + ... + 166861.

Almost surely, 2^66664600 is an apocalyptic number.

It is an amenable number.

66664600 is an abundant number, since it is smaller than the sum of its proper divisors (88331060).

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

66664600 is a wasteful number, since it uses less digits than its factorization.

66664600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333339 (or 333330 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 66664600 is about 8164.8392513264. The cubic root of 66664600 is about 405.4759430336.

The spelling of 66664600 in words is "sixty-six million, six hundred sixty-four thousand, six hundred".