525490565863561 has 9 divisors (see below), whose sum is σ = 533452329620301. Its totient is φ = 517645910133132.

The previous prime is 525490565863513. The next prime is 525490565863579. The reversal of 525490565863561 is 165368565094525.

The square root of 525490565863561 is 22923581.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 525490565863561 - 2¹³ = 525490565855369 is a prime.

It is a super-2 number, since 2×525490565863561² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525490565863511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1535708856 + ... + 1536050998.

Almost surely, 2^{525490565863561} is an apocalyptic number.

525490565863561 is the 22923581-st square number.

525490565863561 is the 11461791-st centered octagonal number.

It is an amenable number.

525490565863561 is a deficient number, since it is larger than the sum of its proper divisors (7961763756740).

525490565863561 is an frugal number, since it uses more digits than its factorization.

525490565863561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684420 (or 342210 counting only the distinct ones).

The product of its (nonzero) digits is 1166400000, while the sum is 70.

The spelling of 525490565863561 in words is "five hundred twenty-five trillion, four hundred ninety billion, five hundred sixty-five million, eight hundred sixty-three thousand, five hundred sixty-one".