201664145 has 16 divisors (see below), whose sum is σ = 251424768. Its totient is φ = 155113920.

The previous prime is 201664129. The next prime is 201664147. The reversal of 201664145 is 541466102.

It is not a de Polignac number, because 201664145 - 2⁴ = 201664129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201664147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20192 + ... + 28478.

It is an arithmetic number, because the mean of its divisors is an integer number (15714048).

Almost surely, 2^201664145 is an apocalyptic number.

It is an amenable number.

201664145 is a deficient number, since it is larger than the sum of its proper divisors (49760623).

201664145 is a wasteful number, since it uses less digits than its factorization.

201664145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 201664145 is about 14200.8501506072. The cubic root of 201664145 is about 586.4210660946.

The spelling of 201664145 in words is "two hundred one million, six hundred sixty-four thousand, one hundred forty-five".