503201661 has 16 divisors (see below), whose sum is σ = 678184320. Its totient is φ = 331853760.

The previous prime is 503201603. The next prime is 503201669. The reversal of 503201661 is 166102305.

It is not a de Polignac number, because 503201661 - 2⁶ = 503201597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503201669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385536 + ... + 386838.

It is an arithmetic number, because the mean of its divisors is an integer number (42386520).

Almost surely, 2^503201661 is an apocalyptic number.

It is an amenable number.

503201661 is a deficient number, since it is larger than the sum of its proper divisors (174982659).

503201661 is a wasteful number, since it uses less digits than its factorization.

503201661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 503201661 is about 22432.1568512705. The cubic root of 503201661 is about 795.3910295025.

Adding to 503201661 its reverse (166102305), we get a palindrome (669303966).

The spelling of 503201661 in words is "five hundred three million, two hundred one thousand, six hundred sixty-one".