16645970 has 24 divisors (see below), whose sum is σ = 32936652. Its totient is φ = 6052640.

The previous prime is 16645939. The next prime is 16645973. The reversal of 16645970 is 7954661.

It can be written as a sum of positive squares in 2 ways, for example, as 14569489 + 2076481 = 3817^2 + 1441^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16645973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5669 + ... + 8088.

Almost surely, 2^16645970 is an apocalyptic number.

16645970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16645970 is a deficient number, since it is larger than the sum of its proper divisors (16290682).

16645970 is a wasteful number, since it uses less digits than its factorization.

16645970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13786 (or 13775 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 16645970 is about 4079.9473035813. The cubic root of 16645970 is about 255.3306999950.

The spelling of 16645970 in words is "sixteen million, six hundred forty-five thousand, nine hundred seventy".