66659000 has 64 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 26448000.

The previous prime is 66658997. The next prime is 66659003. The reversal of 66659000 is 95666.

It is an interprime number because it is at equal distance from previous prime (66658997) and next prime (66659003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66659003) 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, 190826 + ... + 191174.

It is an arithmetic number, because the mean of its divisors is an integer number (2457000).

Almost surely, 2^66659000 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 66659000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624000).

66659000 is an abundant number, since it is smaller than the sum of its proper divisors (90589000).

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

66659000 is a wasteful number, since it uses less digits than its factorization.

66659000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 66659000 is about 8164.4963102447. The cubic root of 66659000 is about 405.4645890373.

The spelling of 66659000 in words is "sixty-six million, six hundred fifty-nine thousand".