66660441 has 4 divisors (see below), whose sum is σ = 88880592. Its totient is φ = 44440292.

The previous prime is 66660439. The next prime is 66660457. The reversal of 66660441 is 14406666.

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 a cyclic number.

It is not a de Polignac number, because 66660441 - 2¹ = 66660439 is a prime.

It is a super-2 number, since 2×66660441² = 8887228788628962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66660401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11110071 + ... + 11110076.

It is an arithmetic number, because the mean of its divisors is an integer number (22220148).

Almost surely, 2^66660441 is an apocalyptic number.

It is an amenable number.

66660441 is a deficient number, since it is larger than the sum of its proper divisors (22220151).

66660441 is a wasteful number, since it uses less digits than its factorization.

66660441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22220150.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 66660441 is about 8164.5845577102. The cubic root of 66660441 is about 405.4675107246.

The spelling of 66660441 in words is "sixty-six million, six hundred sixty thousand, four hundred forty-one".