53517720416581 has 2 divisors, whose sum is σ = 53517720416582. Its totient is φ = 53517720416580.

The previous prime is 53517720416533. The next prime is 53517720416623. The reversal of 53517720416581 is 18561402771535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45336924892900 + 8180795523681 = 6733270^2 + 2860209^2 .

It is a cyclic number.

It is not a de Polignac number, because 53517720416581 - 2⁴¹ = 51318697161029 is a prime.

It is a super-2 number, since 2×53517720416581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53517720413581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26758860208290 + 26758860208291.

It is an arithmetic number, because the mean of its divisors is an integer number (26758860208291).

Almost surely, 2^{53517720416581} is an apocalyptic number.

It is an amenable number.

53517720416581 is a deficient number, since it is larger than the sum of its proper divisors (1).

53517720416581 is an equidigital number, since it uses as much as digits as its factorization.

53517720416581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 53517720416581 in words is "fifty-three trillion, five hundred seventeen billion, seven hundred twenty million, four hundred sixteen thousand, five hundred eighty-one".