201664043 has 16 divisors (see below), whose sum is σ = 243045120. Its totient is φ = 163459296.

The previous prime is 201664039. The next prime is 201664087. The reversal of 201664043 is 340466102.

It is not a de Polignac number, because 201664043 - 2² = 201664039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201664003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99680 + ... + 101682.

It is an arithmetic number, because the mean of its divisors is an integer number (15190320).

Almost surely, 2^201664043 is an apocalyptic number.

201664043 is a deficient number, since it is larger than the sum of its proper divisors (41381077).

201664043 is a wasteful number, since it uses less digits than its factorization.

201664043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 201664043 is about 14200.8465592724. The cubic root of 201664043 is about 586.4209672256.

The spelling of 201664043 in words is "two hundred one million, six hundred sixty-four thousand, forty-three".