16666069 has 16 divisors (see below), whose sum is σ = 20642688. Its totient is φ = 13128192.

The previous prime is 16666061. The next prime is 16666081. The reversal of 16666069 is 96066661.

It is a happy number.

It is not a de Polignac number, because 16666069 - 2³ = 16666061 is a prime.

It is a super-2 number, since 2×16666069² = 555515711825522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666061) 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, 3489 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (1290168).

Almost surely, 2^16666069 is an apocalyptic number.

It is an amenable number.

16666069 is a deficient number, since it is larger than the sum of its proper divisors (3976619).

16666069 is a wasteful number, since it uses less digits than its factorization.

16666069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 16666069 is about 4082.4097050639. The cubic root of 16666069 is about 255.4334241107.

The spelling of 16666069 in words is "sixteen million, six hundred sixty-six thousand, sixty-nine".