666661153 has 8 divisors (see below), whose sum is σ = 685771560. Its totient is φ = 647608320.

The previous prime is 666661147. The next prime is 666661159. The reversal of 666661153 is 351166666.

666661153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666661147) and next prime (666661159).

It can be written as a sum of positive squares in 4 ways, for example, as 148279329 + 518381824 = 12177^2 + 22768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666661153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666661159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9663 + ... + 37771.

It is an arithmetic number, because the mean of its divisors is an integer number (85721445).

Almost surely, 2^666661153 is an apocalyptic number.

It is an amenable number.

666661153 is a deficient number, since it is larger than the sum of its proper divisors (19110407).

666661153 is a wasteful number, since it uses less digits than its factorization.

666661153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28787.

The product of its digits is 116640, while the sum is 40.

The square root of 666661153 is about 25819.7822027995. The cubic root of 666661153 is about 873.5780564139.

The spelling of 666661153 in words is "six hundred sixty-six million, six hundred sixty-one thousand, one hundred fifty-three".