660036213 has 6 divisors (see below), whose sum is σ = 953385654. Its totient is φ = 440024136.

The previous prime is 660036173. The next prime is 660036263. The reversal of 660036213 is 312630066.

660036213 is a `hidden beast` number, since 6 + 600 + 36 + 21 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 490046769 + 169989444 = 22137^2 + 13038^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660036213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660036263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36668670 + ... + 36668687.

It is an arithmetic number, because the mean of its divisors is an integer number (158897609).

Almost surely, 2^660036213 is an apocalyptic number.

It is an amenable number.

660036213 is a deficient number, since it is larger than the sum of its proper divisors (293349441).

660036213 is a wasteful number, since it uses less digits than its factorization.

660036213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73337363 (or 73337360 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 660036213 is about 25691.1699422194. The cubic root of 660036213 is about 870.6746926473.

Adding to 660036213 its reverse (312630066), we get a palindrome (972666279).

The spelling of 660036213 in words is "six hundred sixty million, thirty-six thousand, two hundred thirteen".