66666700 has 18 divisors (see below), whose sum is σ = 144666956. Its totient is φ = 26666640.

The previous prime is 66666683. The next prime is 66666713. The reversal of 66666700 is 766666.

66666700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66666700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333234 + ... + 333433.

Almost surely, 2^66666700 is an apocalyptic number.

It is an amenable number.

66666700 is an abundant number, since it is smaller than the sum of its proper divisors (78000256).

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

66666700 is a wasteful number, since it uses less digits than its factorization.

66666700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666681 (or 666674 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 66666700 is about 8164.9678505185. The cubic root of 66666700 is about 405.4802006182.

It can be divided in two parts, 6666 and 6700, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 66666700 in words is "sixty-six million, six hundred sixty-six thousand, seven hundred".