66019000 has 64 divisors (see below), whose sum is σ = 156180960. Its totient is φ = 26118400.

The previous prime is 66018991. The next prime is 66019001. The reversal of 66019000 is 91066.

It is a super-2 number, since 2×66019000² = 8717016722000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66019001) 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, 106692 + ... + 107308.

Almost surely, 2^66019000 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 66019000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78090480).

66019000 is an abundant number, since it is smaller than the sum of its proper divisors (90161960).

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

66019000 is a wasteful number, since it uses less digits than its factorization.

66019000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 66019000 is about 8125.2076896532. The cubic root of 66019000 is about 404.1627779175.

The spelling of 66019000 in words is "sixty-six million, nineteen thousand".