66605101 has 4 divisors (see below), whose sum is σ = 66940000. Its totient is φ = 66270204.

The previous prime is 66605059. The next prime is 66605117. The reversal of 66605101 is 10150666.

66605101 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 66605101 - 2⁷ = 66604973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605191) 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, 167151 + ... + 167548.

It is an arithmetic number, because the mean of its divisors is an integer number (16735000).

Almost surely, 2^66605101 is an apocalyptic number.

It is an amenable number.

66605101 is a deficient number, since it is larger than the sum of its proper divisors (334899).

66605101 is a wasteful number, since it uses less digits than its factorization.

66605101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334898.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66605101 is about 8161.1948267395. The cubic root of 66605101 is about 405.3552763223.

Adding to 66605101 its reverse (10150666), we get a palindrome (76755767).

The spelling of 66605101 in words is "sixty-six million, six hundred five thousand, one hundred one".