503145316665521 has 8 divisors (see below), whose sum is σ = 505195252820544. Its totient is φ = 501096417148080.

The previous prime is 503145316665469. The next prime is 503145316665533. The reversal of 503145316665521 is 125566613541305.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 503145316665521 - 2⁴² = 498747270154417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (503145316665821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258186686 + ... + 260128151.

It is an arithmetic number, because the mean of its divisors is an integer number (63149406602568).

Almost surely, 2^{503145316665521} is an apocalyptic number.

It is an amenable number.

503145316665521 is a deficient number, since it is larger than the sum of its proper divisors (2049936155023).

503145316665521 is a wasteful number, since it uses less digits than its factorization.

503145316665521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518318791.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 503145316665521 in words is "five hundred three trillion, one hundred forty-five billion, three hundred sixteen million, six hundred sixty-five thousand, five hundred twenty-one".