66211930 has 24 divisors (see below), whose sum is σ = 123448572. Its totient is φ = 25568256.

The previous prime is 66211919. The next prime is 66212021. The reversal of 66211930 is 3911266.

66211930 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 6 ways, for example, as 11703241 + 54508689 = 3421^2 + 7383^2 .

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, 4474 + ... + 12346.

Almost surely, 2^66211930 is an apocalyptic number.

66211930 is a deficient number, since it is larger than the sum of its proper divisors (57236642).

66211930 is a wasteful number, since it uses less digits than its factorization.

66211930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7938 (or 7909 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66211930 is about 8137.0713404763. The cubic root of 66211930 is about 404.5560954534.

The spelling of 66211930 in words is "sixty-six million, two hundred eleven thousand, nine hundred thirty".