66042001 has 2 divisors, whose sum is σ = 66042002. Its totient is φ = 66042000.

The previous prime is 66041977. The next prime is 66042007. The reversal of 66042001 is 10024066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 24245776 = 6465^2 + 4924^2 .

It is a cyclic number.

It is not a de Polignac number, because 66042001 - 2⁹ = 66041489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66042001.

It is not a weakly prime, because it can be changed into another prime (66042007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33021000 + 33021001.

It is an arithmetic number, because the mean of its divisors is an integer number (33021001).

Almost surely, 2^66042001 is an apocalyptic number.

It is an amenable number.

66042001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66042001 is an equidigital number, since it uses as much as digits as its factorization.

66042001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 66042001 is about 8126.6229763660. The cubic root of 66042001 is about 404.2097091982.

Adding to 66042001 its reverse (10024066), we get a palindrome (76066067).

The spelling of 66042001 in words is "sixty-six million, forty-two thousand, one".