660575213 has 2 divisors, whose sum is σ = 660575214. Its totient is φ = 660575212.

The previous prime is 660575191. The next prime is 660575233. The reversal of 660575213 is 312575066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426546409 + 234028804 = 20653^2 + 15298^2 .

It is a cyclic number.

It is not a de Polignac number, because 660575213 - 2²⁸ = 392139757 is a prime.

It is a super-2 number, since 2×660575213² = 872719224059990738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660575233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330287606 + 330287607.

It is an arithmetic number, because the mean of its divisors is an integer number (330287607).

Almost surely, 2^660575213 is an apocalyptic number.

It is an amenable number.

660575213 is a deficient number, since it is larger than the sum of its proper divisors (1).

660575213 is an equidigital number, since it uses as much as digits as its factorization.

660575213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 660575213 is about 25701.6577869989. The cubic root of 660575213 is about 870.9116321581.

It can be divided in two parts, 6605 and 75213, that added together give a palindrome (81818).

The spelling of 660575213 in words is "six hundred sixty million, five hundred seventy-five thousand, two hundred thirteen".