5197825616521 has 2 divisors, whose sum is σ = 5197825616522. Its totient is φ = 5197825616520.

The previous prime is 5197825616519. The next prime is 5197825616587. The reversal of 5197825616521 is 1256165287915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2877501542400 + 2320324074121 = 1696320^2 + 1523261^2 .

It is a cyclic number.

It is not a de Polignac number, because 5197825616521 - 2¹ = 5197825616519 is a prime.

It is a super-2 number, since 2×5197825616521² (a number of 26 digits) contains 22 as substring.

Together with 5197825616519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5197825613521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2598912808260 + 2598912808261.

It is an arithmetic number, because the mean of its divisors is an integer number (2598912808261).

Almost surely, 2^{5197825616521} is an apocalyptic number.

It is an amenable number.

5197825616521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5197825616521 is an equidigital number, since it uses as much as digits as its factorization.

5197825616521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 58.

The spelling of 5197825616521 in words is "five trillion, one hundred ninety-seven billion, eight hundred twenty-five million, six hundred sixteen thousand, five hundred twenty-one".