66111001 has 4 divisors (see below), whose sum is σ = 72121104. Its totient is φ = 60100900.

The previous prime is 66110987. The next prime is 66111043. The reversal of 66111001 is 10011166.

66111001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66111001 - 2⁵ = 66110969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66111061) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3005035 + ... + 3005056.

It is an arithmetic number, because the mean of its divisors is an integer number (18030276).

Almost surely, 2^66111001 is an apocalyptic number.

It is an amenable number.

66111001 is a deficient number, since it is larger than the sum of its proper divisors (6010103).

66111001 is a wasteful number, since it uses less digits than its factorization.

66111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010102.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 66111001 is about 8130.8671739243. The cubic root of 66111001 is about 404.3504315765.

Adding to 66111001 its reverse (10011166), we get a palindrome (76122167).

The spelling of 66111001 in words is "sixty-six million, one hundred eleven thousand, one".