666089493 has 16 divisors (see below), whose sum is σ = 893555712. Its totient is φ = 441350000.

The previous prime is 666089491. The next prime is 666089507. The reversal of 666089493 is 394980666.

It is a cyclic number.

It is not a de Polignac number, because 666089493 - 2¹ = 666089491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666089491) 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, 685498 + ... + 686468.

It is an arithmetic number, because the mean of its divisors is an integer number (55847232).

Almost surely, 2^666089493 is an apocalyptic number.

It is an amenable number.

666089493 is a deficient number, since it is larger than the sum of its proper divisors (227466219).

666089493 is a wasteful number, since it uses less digits than its factorization.

666089493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 666089493 is about 25808.7096345400. The cubic root of 666089493 is about 873.3282881275.

The spelling of 666089493 in words is "six hundred sixty-six million, eighty-nine thousand, four hundred ninety-three".