521885478145613 has 8 divisors (see below), whose sum is σ = 534978803215800. Its totient is φ = 508952807371008.

The previous prime is 521885478145609. The next prime is 521885478145649. The reversal of 521885478145613 is 316541874588125.

It can be written as a sum of positive squares in 4 ways, for example, as 129011137906249 + 392874340239364 = 11358307^2 + 19821058^2 .

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 521885478145613 - 2² = 521885478145609 is a prime.

It is a super-2 number, since 2×521885478145613² (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 (521885478145673) 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, 40163567318 + ... + 40163580311.

It is an arithmetic number, because the mean of its divisors is an integer number (66872350401975).

Almost surely, 2^{521885478145613} is an apocalyptic number.

It is an amenable number.

521885478145613 is a deficient number, since it is larger than the sum of its proper divisors (13093325070187).

521885478145613 is an equidigital number, since it uses as much as digits as its factorization.

521885478145613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80327147791.

The product of its digits is 258048000, while the sum is 68.

The spelling of 521885478145613 in words is "five hundred twenty-one trillion, eight hundred eighty-five billion, four hundred seventy-eight million, one hundred forty-five thousand, six hundred thirteen".