660676213 has 4 divisors (see below), whose sum is σ = 670537120. Its totient is φ = 650815308.

The previous prime is 660676187. The next prime is 660676223. The reversal of 660676213 is 312676066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660676213 - 2¹⁷ = 660545141 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 (660676223) 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, 4930353 + ... + 4930486.

It is an arithmetic number, because the mean of its divisors is an integer number (167634280).

Almost surely, 2^660676213 is an apocalyptic number.

It is an amenable number.

660676213 is a deficient number, since it is larger than the sum of its proper divisors (9860907).

660676213 is an equidigital number, since it uses as much as digits as its factorization.

660676213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9860906.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 660676213 is about 25703.6225657007. The cubic root of 660676213 is about 870.9560165019.

The spelling of 660676213 in words is "six hundred sixty million, six hundred seventy-six thousand, two hundred thirteen".