201606623 has 4 divisors (see below), whose sum is σ = 202356360. Its totient is φ = 200856888.

The previous prime is 201606617. The next prime is 201606631. The reversal of 201606623 is 326606102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201606623 - 2⁴ = 201606607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201606592 and 201606601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201602623) 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 3 ways as a sum of consecutive naturals, for example, 374465 + ... + 375002.

It is an arithmetic number, because the mean of its divisors is an integer number (50589090).

Almost surely, 2^201606623 is an apocalyptic number.

201606623 is a deficient number, since it is larger than the sum of its proper divisors (749737).

201606623 is an equidigital number, since it uses as much as digits as its factorization.

201606623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749736.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 201606623 is about 14198.8247048831. The cubic root of 201606623 is about 586.3653045373.

The spelling of 201606623 in words is "two hundred one million, six hundred six thousand, six hundred twenty-three".