523556503533421 has 8 divisors (see below), whose sum is σ = 524586236895000. Its totient is φ = 522526774624320.

The previous prime is 523556503533403. The next prime is 523556503533431. The reversal of 523556503533421 is 124335305655325.

It can be written as a sum of positive squares in 4 ways, for example, as 394984262872521 + 128572240660900 = 19874211^2 + 11338970^2 .

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 523556503533421 - 2¹⁷ = 523556503402349 is a prime.

It is a super-2 number, since 2×523556503533421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523556503533431) 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, 332481751 + ... + 334052731.

It is an arithmetic number, because the mean of its divisors is an integer number (65573279611875).

Almost surely, 2^{523556503533421} is an apocalyptic number.

It is an amenable number.

523556503533421 is a deficient number, since it is larger than the sum of its proper divisors (1029733361579).

523556503533421 is a wasteful number, since it uses less digits than its factorization.

523556503533421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226239.

The product of its (nonzero) digits is 24300000, while the sum is 52.

The spelling of 523556503533421 in words is "five hundred twenty-three trillion, five hundred fifty-six billion, five hundred three million, five hundred thirty-three thousand, four hundred twenty-one".