66406894 has 16 divisors (see below), whose sum is σ = 100948176. Its totient is φ = 32760000.

The previous prime is 66406883. The next prime is 66406961. The reversal of 66406894 is 49860466.

It is a self number, because there is not a number n which added to its sum of digits gives 66406894.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110194 + ... + 110794.

It is an arithmetic number, because the mean of its divisors is an integer number (6309261).

Almost surely, 2^66406894 is an apocalyptic number.

66406894 is a deficient number, since it is larger than the sum of its proper divisors (34541282).

66406894 is a wasteful number, since it uses less digits than its factorization.

66406894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 66406894 is about 8149.0425204437. The cubic root of 66406894 is about 404.9527842127.

The spelling of 66406894 in words is "sixty-six million, four hundred six thousand, eight hundred ninety-four".