201660653 has 4 divisors (see below), whose sum is σ = 203545440. Its totient is φ = 199775868.

The previous prime is 201660649. The next prime is 201660677. The reversal of 201660653 is 356066102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201660653 - 2² = 201660649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201660353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942233 + ... + 942446.

It is an arithmetic number, because the mean of its divisors is an integer number (50886360).

Almost surely, 2^201660653 is an apocalyptic number.

It is an amenable number.

201660653 is a deficient number, since it is larger than the sum of its proper divisors (1884787).

201660653 is a wasteful number, since it uses less digits than its factorization.

201660653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884786.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 201660653 is about 14200.7271996895. The cubic root of 201660653 is about 586.4176812685.

The spelling of 201660653 in words is "two hundred one million, six hundred sixty thousand, six hundred fifty-three".