666084101 has 4 divisors (see below), whose sum is σ = 684086412. Its totient is φ = 648081792.

The previous prime is 666084077. The next prime is 666084113. The reversal of 666084101 is 101480666.

It is a happy number.

666084101 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.

It can be written as a sum of positive squares in 2 ways, for example, as 456847876 + 209236225 = 21374^2 + 14465^2 .

It is a cyclic number.

It is not a de Polignac number, because 666084101 - 2²² = 661889797 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 (666080101) 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, 9001100 + ... + 9001173.

It is an arithmetic number, because the mean of its divisors is an integer number (171021603).

Almost surely, 2^666084101 is an apocalyptic number.

It is an amenable number.

666084101 is a deficient number, since it is larger than the sum of its proper divisors (18002311).

666084101 is a wasteful number, since it uses less digits than its factorization.

666084101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18002310.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 666084101 is about 25808.6051734688. The cubic root of 666084101 is about 873.3259315878.

The spelling of 666084101 in words is "six hundred sixty-six million, eighty-four thousand, one hundred one".