201640655 has 16 divisors (see below), whose sum is σ = 267344064. Its totient is φ = 145221120.

The previous prime is 201640651. The next prime is 201640679. The reversal of 201640655 is 556046102.

It is not a de Polignac number, because 201640655 - 2² = 201640651 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 (201640651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49616 + ... + 53525.

It is an arithmetic number, because the mean of its divisors is an integer number (16709004).

Almost surely, 2^201640655 is an apocalyptic number.

201640655 is a deficient number, since it is larger than the sum of its proper divisors (65703409).

201640655 is a wasteful number, since it uses less digits than its factorization.

201640655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103186.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 201640655 is about 14200.0230633616. The cubic root of 201640655 is about 586.3982962797.

Adding to 201640655 its reverse (556046102), we get a palindrome (757686757).

The spelling of 201640655 in words is "two hundred one million, six hundred forty thousand, six hundred fifty-five".