66686472 has 48 divisors (see below), whose sum is σ = 181141740. Its totient is φ = 22163328.

The previous prime is 66686443. The next prime is 66686489. The reversal of 66686472 is 27468666.

66686472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 66683556 + 2916 = 8166^2 + 54^2 .

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 11 ways as a sum of consecutive naturals, for example, 27418 + ... + 29750.

Almost surely, 2^66686472 is an apocalyptic number.

It is an amenable number.

66686472 is an abundant number, since it is smaller than the sum of its proper divisors (114455268).

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

66686472 is a wasteful number, since it uses less digits than its factorization.

66686472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2735 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 66686472 is about 8166.1785432355. The cubic root of 66686472 is about 405.5202824086.

The spelling of 66686472 in words is "sixty-six million, six hundred eighty-six thousand, four hundred seventy-two".