201523663 has 4 divisors (see below), whose sum is σ = 219844008. Its totient is φ = 183203320.

The previous prime is 201523657. The next prime is 201523667. The reversal of 201523663 is 366325102.

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 201523663 - 2²¹ = 199426511 is a prime.

It is a super-2 number, since 2×201523663² = 81223573497875138, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201523667) 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 3 ways as a sum of consecutive naturals, for example, 9160156 + ... + 9160177.

It is an arithmetic number, because the mean of its divisors is an integer number (54961002).

Almost surely, 2^201523663 is an apocalyptic number.

201523663 is a deficient number, since it is larger than the sum of its proper divisors (18320345).

201523663 is a wasteful number, since it uses less digits than its factorization.

201523663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18320344.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 201523663 is about 14195.9030357353. The cubic root of 201523663 is about 586.2848648196.

Adding to 201523663 its reverse (366325102), we get a palindrome (567848765).

The spelling of 201523663 in words is "two hundred one million, five hundred twenty-three thousand, six hundred sixty-three".