16666965 has 40 divisors (see below), whose sum is σ = 34151040. Its totient is φ = 7617888.

The previous prime is 16666961. The next prime is 16666997. The reversal of 16666965 is 56966661.

It is not a de Polignac number, because 16666965 - 2² = 16666961 is a prime.

It is a super-2 number, since 2×16666965² = 555575444622450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666961) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 105 + ... + 5774.

It is an arithmetic number, because the mean of its divisors is an integer number (853776).

Almost surely, 2^16666965 is an apocalyptic number.

16666965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16666965 is an abundant number, since it is smaller than the sum of its proper divisors (17484075).

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

16666965 is an equidigital number, since it uses as much as digits as its factorization.

16666965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5903 (or 5894 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 16666965 is about 4082.5194426971. The cubic root of 16666965 is about 255.4380015597.

The spelling of 16666965 in words is "sixteen million, six hundred sixty-six thousand, nine hundred sixty-five".