525566665525 has 24 divisors (see below), whose sum is σ = 713999729664. Its totient is φ = 380589782400.

The previous prime is 525566665523. The next prime is 525566665571.

It is a happy number.

525566665525 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 525566665525 - 2¹ = 525566665523 is a prime.

It is a super-2 number, since 2×525566665525² (a number of 24 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 525566665525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525566665523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4037109 + ... + 4165258.

It is an arithmetic number, because the mean of its divisors is an integer number (29749988736).

Almost surely, 2^525566665525 is an apocalyptic number.

525566665525 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

525566665525 is a deficient number, since it is larger than the sum of its proper divisors (188433064139).

525566665525 is a wasteful number, since it uses less digits than its factorization.

525566665525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202621 (or 8202616 counting only the distinct ones).

The product of its digits is 81000000, while the sum is 58.

The spelling of 525566665525 in words is "five hundred twenty-five billion, five hundred sixty-six million, six hundred sixty-five thousand, five hundred twenty-five".