16605973 has 2 divisors, whose sum is σ = 16605974. Its totient is φ = 16605972.

The previous prime is 16605971. The next prime is 16605997. The reversal of 16605973 is 37950661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 3775249 = 3582^2 + 1943^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605973 - 2¹ = 16605971 is a prime.

Together with 16605971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16605971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302986 + 8302987.

It is an arithmetic number, because the mean of its divisors is an integer number (8302987).

Almost surely, 2^16605973 is an apocalyptic number.

It is an amenable number.

16605973 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605973 is an equidigital number, since it uses as much as digits as its factorization.

16605973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 16605973 is about 4075.0426991628. The cubic root of 16605973 is about 255.1260327901.

It can be divided in two parts, 16605 and 973, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16605973 in words is "sixteen million, six hundred five thousand, nine hundred seventy-three".