66211944 has 64 divisors (see below), whose sum is σ = 171383040. Its totient is φ = 21300480.

The previous prime is 66211919. The next prime is 66212021. The reversal of 66211944 is 44911266.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153409 + ... + 153839.

It is an arithmetic number, because the mean of its divisors is an integer number (2677860).

Almost surely, 2^66211944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66211944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85691520).

66211944 is an abundant number, since it is smaller than the sum of its proper divisors (105171096).

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

66211944 is a wasteful number, since it uses less digits than its factorization.

66211944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 646 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 66211944 is about 8137.0722007366. The cubic root of 66211944 is about 404.5561239668.

The spelling of 66211944 in words is "sixty-six million, two hundred eleven thousand, nine hundred forty-four".