16665953 has 2 divisors, whose sum is σ = 16665954. Its totient is φ = 16665952.

The previous prime is 16665949. The next prime is 16666019. The reversal of 16665953 is 35956661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14615329 + 2050624 = 3823^2 + 1432^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665953 - 2² = 16665949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16665953.

It is not a weakly prime, because it can be changed into another prime (16662953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332976 + 8332977.

It is an arithmetic number, because the mean of its divisors is an integer number (8332977).

Almost surely, 2^16665953 is an apocalyptic number.

It is an amenable number.

16665953 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665953 is an equidigital number, since it uses as much as digits as its factorization.

16665953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 41.

The square root of 16665953 is about 4082.3954977439. The cubic root of 16665953 is about 255.4328314825.

The spelling of 16665953 in words is "sixteen million, six hundred sixty-five thousand, nine hundred fifty-three".