66401241 has 4 divisors (see below), whose sum is σ = 88534992. Its totient is φ = 44267492.

The previous prime is 66401239. The next prime is 66401243. The reversal of 66401241 is 14210466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66401239) and next prime (66401243).

It is a cyclic number.

It is not a de Polignac number, because 66401241 - 2¹ = 66401239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66401243) 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 3 ways as a sum of consecutive naturals, for example, 11066871 + ... + 11066876.

It is an arithmetic number, because the mean of its divisors is an integer number (22133748).

Almost surely, 2^66401241 is an apocalyptic number.

It is an amenable number.

66401241 is a deficient number, since it is larger than the sum of its proper divisors (22133751).

66401241 is a wasteful number, since it uses less digits than its factorization.

66401241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22133750.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 66401241 is about 8148.6956624972. The cubic root of 66401241 is about 404.9412931214.

The spelling of 66401241 in words is "sixty-six million, four hundred one thousand, two hundred forty-one".