666659000 has 128 divisors (see below), whose sum is σ = 1798917120. Its totient is φ = 226512000.

The previous prime is 666658991. The next prime is 666659009. The reversal of 666659000 is 956666.

It is an interprime number because it is at equal distance from previous prime (666658991) and next prime (666659009).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666659009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 916637 + ... + 917363.

It is an arithmetic number, because the mean of its divisors is an integer number (14054040).

Almost surely, 2^666659000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666659000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899458560).

666659000 is an abundant number, since it is smaller than the sum of its proper divisors (1132258120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666659000 is a wasteful number, since it uses less digits than its factorization.

666659000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 666659000 is about 25819.7405099277. The cubic root of 666659000 is about 873.5771159983.

The spelling of 666659000 in words is "six hundred sixty-six million, six hundred fifty-nine thousand".