666746653 has 16 divisors (see below), whose sum is σ = 695241216. Its totient is φ = 638951040.

The previous prime is 666746629. The next prime is 666746657. The reversal of 666746653 is 356647666.

It is a cyclic number.

It is not a de Polignac number, because 666746653 - 2¹³ = 666738461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666746597 and 666746606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666746657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897000 + ... + 897742.

It is an arithmetic number, because the mean of its divisors is an integer number (43452576).

Almost surely, 2^666746653 is an apocalyptic number.

It is an amenable number.

666746653 is a deficient number, since it is larger than the sum of its proper divisors (28494563).

666746653 is a wasteful number, since it uses less digits than its factorization.

666746653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its digits is 3265920, while the sum is 49.

The square root of 666746653 is about 25821.4378569436. The cubic root of 666746653 is about 873.6154005883.

The spelling of 666746653 in words is "six hundred sixty-six million, seven hundred forty-six thousand, six hundred fifty-three".