503261430533661 has 4 divisors (see below), whose sum is σ = 671015240711552. Its totient is φ = 335507620355772.

The previous prime is 503261430533657. The next prime is 503261430533663. The reversal of 503261430533661 is 166335034162305.

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.

It is not a de Polignac number, because 503261430533661 - 2² = 503261430533657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 503261430533661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503261430533663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83876905088941 + ... + 83876905088946.

It is an arithmetic number, because the mean of its divisors is an integer number (167753810177888).

Almost surely, 2^{503261430533661} is an apocalyptic number.

It is an amenable number.

503261430533661 is a deficient number, since it is larger than the sum of its proper divisors (167753810177891).

503261430533661 is a wasteful number, since it uses less digits than its factorization.

503261430533661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167753810177890.

The product of its (nonzero) digits is 3499200, while the sum is 48.

Adding to 503261430533661 its reverse (166335034162305), we get a palindrome (669596464695966).

The spelling of 503261430533661 in words is "five hundred three trillion, two hundred sixty-one billion, four hundred thirty million, five hundred thirty-three thousand, six hundred sixty-one".