66000999 has 16 divisors (see below), whose sum is σ = 89879040. Its totient is φ = 43068480.

The previous prime is 66000997. The next prime is 66001027. The reversal of 66000999 is 99900066.

It is not a de Polignac number, because 66000999 - 2¹ = 66000997 is a prime.

It is a super-2 number, since 2×66000999² = 8712263737996002, which contains 22 as substring.

66000999 is a modest number, since divided by 999 gives 66 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000997) 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, 49074 + ... + 50400.

It is an arithmetic number, because the mean of its divisors is an integer number (5617440).

Almost surely, 2^66000999 is an apocalyptic number.

66000999 is a deficient number, since it is larger than the sum of its proper divisors (23878041).

66000999 is a wasteful number, since it uses less digits than its factorization.

66000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 66000999 is about 8124.0998886030. The cubic root of 66000999 is about 404.1260410412.

The spelling of 66000999 in words is "sixty-six million, nine hundred ninety-nine", and thus it is an aban number.