503040655321 has 4 divisors (see below), whose sum is σ = 509101386192. Its totient is φ = 496979924452.

The previous prime is 503040655301. The next prime is 503040655333. The reversal of 503040655321 is 123556040305.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123556040305 = 5 ⋅24711208061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-503040655321 is a prime.

It is a super-2 number, since 2×503040655321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503040655301) 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, 3030365311 + ... + 3030365476.

It is an arithmetic number, because the mean of its divisors is an integer number (127275346548).

Almost surely, 2^503040655321 is an apocalyptic number.

It is an amenable number.

503040655321 is a deficient number, since it is larger than the sum of its proper divisors (6060730871).

503040655321 is an equidigital number, since it uses as much as digits as its factorization.

503040655321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060730870.

The product of its (nonzero) digits is 54000, while the sum is 34.

Adding to 503040655321 its reverse (123556040305), we get a palindrome (626596695626).

The spelling of 503040655321 in words is "five hundred three billion, forty million, six hundred fifty-five thousand, three hundred twenty-one".