660101 has 4 divisors (see below), whose sum is σ = 710892. Its totient is φ = 609312.

The previous prime is 660097. The next prime is 660103. The reversal of 660101 is 101066.

660101 = 574² + 575².

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 330625 + 329476 = 575^2 + 574^2 .

It is a cyclic number.

It is not a de Polignac number, because 660101 - 2² = 660097 is a prime.

660101 is a modest number, since divided by 101 gives 66 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25376 + ... + 25401.

It is an arithmetic number, because the mean of its divisors is an integer number (177723).

2⁶⁶⁰¹⁰¹ is an apocalyptic number.

660101 is the 575-th centered square number.

It is an amenable number.

660101 is a deficient number, since it is larger than the sum of its proper divisors (50791).

660101 is a wasteful number, since it uses less digits than its factorization.

660101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50790.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 660101 is about 812.4659992886. The cubic root of 660101 is about 87.0703179244.

Adding to 660101 its reverse (101066), we get a palindrome (761167).

The spelling of 660101 in words is "six hundred sixty thousand, one hundred one".