66311894 has 16 divisors (see below), whose sum is σ = 109509840. Its totient is φ = 29864160.

The previous prime is 66311879. The next prime is 66311897. The reversal of 66311894 is 49811366.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66311897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11429 + ... + 16224.

It is an arithmetic number, because the mean of its divisors is an integer number (6844365).

Almost surely, 2^66311894 is an apocalyptic number.

66311894 is a deficient number, since it is larger than the sum of its proper divisors (43197946).

66311894 is a wasteful number, since it uses less digits than its factorization.

66311894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27775.

The product of its digits is 31104, while the sum is 38.

The square root of 66311894 is about 8143.2115286292. The cubic root of 66311894 is about 404.7595870322.

The spelling of 66311894 in words is "sixty-six million, three hundred eleven thousand, eight hundred ninety-four".