66559101 has 24 divisors (see below), whose sum is σ = 104279904. Its totient is φ = 37648800.

The previous prime is 66559099. The next prime is 66559117. The reversal of 66559101 is 10195566.

It is not a de Polignac number, because 66559101 - 2¹ = 66559099 is a prime.

It is a super-2 number, since 2×66559101² = 8860227851856402, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66559151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12606 + ... + 17088.

It is an arithmetic number, because the mean of its divisors is an integer number (4344996).

Almost surely, 2^66559101 is an apocalyptic number.

It is an amenable number.

66559101 is a deficient number, since it is larger than the sum of its proper divisors (37720803).

66559101 is a wasteful number, since it uses less digits than its factorization.

66559101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601 (or 4594 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 66559101 is about 8158.3761251857. The cubic root of 66559101 is about 405.2619369399.

The spelling of 66559101 in words is "sixty-six million, five hundred fifty-nine thousand, one hundred one".