85520810719525 has 6 divisors (see below), whose sum is σ = 106045805292242. Its totient is φ = 68416648575600.

The previous prime is 85520810719517. The next prime is 85520810719549. The reversal of 85520810719525 is 52591701802558.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 563463412164 + 84957347307361 = 750642^2 + 9217231^2 .

It is not a de Polignac number, because 85520810719525 - 2³ = 85520810719517 is a prime.

It is a super-2 number, since 2×85520810719525² (a number of 29 digits) contains 22 as substring.

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 85520810719525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1710416214366 + ... + 1710416214415.

Almost surely, 2^{85520810719525} is an apocalyptic number.

It is an amenable number.

85520810719525 is a deficient number, since it is larger than the sum of its proper divisors (20524994572717).

85520810719525 is a wasteful number, since it uses less digits than its factorization.

85520810719525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420832428791 (or 3420832428786 counting only the distinct ones).

The product of its (nonzero) digits is 10080000, while the sum is 58.

The spelling of 85520810719525 in words is "eighty-five trillion, five hundred twenty billion, eight hundred ten million, seven hundred nineteen thousand, five hundred twenty-five".