66021041 has 16 divisors (see below), whose sum is σ = 70391808. Its totient is φ = 61824000.

The previous prime is 66021037. The next prime is 66021071. The reversal of 66021041 is 14012066.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66021041 - 2² = 66021037 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66021071) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 164441 + ... + 164841.

It is an arithmetic number, because the mean of its divisors is an integer number (4399488).

Almost surely, 2^66021041 is an apocalyptic number.

It is an amenable number.

66021041 is a deficient number, since it is larger than the sum of its proper divisors (4370767).

66021041 is a wasteful number, since it uses less digits than its factorization.

66021041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 66021041 is about 8125.3332854720. Note that the first 3 decimals coincide. The cubic root of 66021041 is about 404.1669428182.

The spelling of 66021041 in words is "sixty-six million, twenty-one thousand, forty-one".