666698545 has 24 divisors (see below), whose sum is σ = 832815360. Its totient is φ = 512339520.

The previous prime is 666698533. The next prime is 666698573. The reversal of 666698545 is 545896666.

666698545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666698545 - 2²³ = 658309937 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1391616 + ... + 1392094.

It is an arithmetic number, because the mean of its divisors is an integer number (34700640).

Almost surely, 2^666698545 is an apocalyptic number.

It is an amenable number.

666698545 is a deficient number, since it is larger than the sum of its proper divisors (166116815).

666698545 is a wasteful number, since it uses less digits than its factorization.

666698545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 844 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 55.

The square root of 666698545 is about 25820.5062886071. The cubic root of 666698545 is about 873.5943886590.

The spelling of 666698545 in words is "six hundred sixty-six million, six hundred ninety-eight thousand, five hundred forty-five".