66100181 has 8 divisors (see below), whose sum is σ = 75902784. Its totient is φ = 56387520.

The previous prime is 66100117. The next prime is 66100187. The reversal of 66100181 is 18100166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66100181 - 2⁶ = 66100117 is a prime.

It is a super-2 number, since 2×66100181² = 8738467856465522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66100187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20900 + ... + 23853.

It is an arithmetic number, because the mean of its divisors is an integer number (9487848).

Almost surely, 2^66100181 is an apocalyptic number.

It is an amenable number.

66100181 is a deficient number, since it is larger than the sum of its proper divisors (9802603).

66100181 is a wasteful number, since it uses less digits than its factorization.

66100181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44971.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 66100181 is about 8130.2017810138. The cubic root of 66100181 is about 404.3283711514.

The spelling of 66100181 in words is "sixty-six million, one hundred thousand, one hundred eighty-one".