503165141640221 has 2 divisors, whose sum is σ = 503165141640222. Its totient is φ = 503165141640220.

The previous prime is 503165141640209. The next prime is 503165141640263. The reversal of 503165141640221 is 122046141561305.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493553988405625 + 9611153234596 = 22216075^2 + 3100186^2 .

It is a cyclic number.

It is not a de Polignac number, because 503165141640221 - 2²² = 503165137445917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503165141660221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251582570820110 + 251582570820111.

It is an arithmetic number, because the mean of its divisors is an integer number (251582570820111).

Almost surely, 2^{503165141640221} is an apocalyptic number.

It is an amenable number.

503165141640221 is a deficient number, since it is larger than the sum of its proper divisors (1).

503165141640221 is an equidigital number, since it uses as much as digits as its factorization.

503165141640221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 503165141640221 in words is "five hundred three trillion, one hundred sixty-five billion, one hundred forty-one million, six hundred forty thousand, two hundred twenty-one".