16900645 has 4 divisors (see below), whose sum is σ = 20280780. Its totient is φ = 13520512.

The previous prime is 16900621. The next prime is 16900679. The reversal of 16900645 is 54600961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6155361 + 10745284 = 2481^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 16900645 - 2⁷ = 16900517 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690060 + ... + 1690069.

It is an arithmetic number, because the mean of its divisors is an integer number (5070195).

Almost surely, 2^16900645 is an apocalyptic number.

It is an amenable number.

16900645 is a deficient number, since it is larger than the sum of its proper divisors (3380135).

16900645 is an equidigital number, since it uses as much as digits as its factorization.

16900645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380134.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 16900645 is about 4111.0394062816. The cubic root of 16900645 is about 256.6262590762.

The spelling of 16900645 in words is "sixteen million, nine hundred thousand, six hundred forty-five".