503165541204421 has 2 divisors, whose sum is σ = 503165541204422. Its totient is φ = 503165541204420.

The previous prime is 503165541204413. The next prime is 503165541204457. The reversal of 503165541204421 is 124402145561305.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451370675376196 + 51794865828225 = 21245486^2 + 7196865^2 .

It is a cyclic number.

It is not a de Polignac number, because 503165541204421 - 2³ = 503165541204413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503165541202421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251582770602210 + 251582770602211.

It is an arithmetic number, because the mean of its divisors is an integer number (251582770602211).

Almost surely, 2^{503165541204421} is an apocalyptic number.

It is an amenable number.

503165541204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

503165541204421 is an equidigital number, since it uses as much as digits as its factorization.

503165541204421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 43.

Adding to 503165541204421 its reverse (124402145561305), we get a palindrome (627567686765726).

The spelling of 503165541204421 in words is "five hundred three trillion, one hundred sixty-five billion, five hundred forty-one million, two hundred four thousand, four hundred twenty-one".