66686364 has 36 divisors (see below), whose sum is σ = 169008840. Its totient is φ = 22170720.

The previous prime is 66686357. The next prime is 66686369. The reversal of 66686364 is 46368666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66686364² = 8894142287080992, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66686369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12874 + ... + 17294.

It is an arithmetic number, because the mean of its divisors is an integer number (4694690).

Almost surely, 2^66686364 is an apocalyptic number.

It is an amenable number.

66686364 is an abundant number, since it is smaller than the sum of its proper divisors (102322476).

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

66686364 is a wasteful number, since it uses less digits than its factorization.

66686364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850 (or 4845 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 66686364 is about 8166.1719305927. The cubic root of 66686364 is about 405.5200634926.

The spelling of 66686364 in words is "sixty-six million, six hundred eighty-six thousand, three hundred sixty-four".