525440669645 has 18 divisors (see below), whose sum is σ = 669835620702. Its totient is φ = 395605168896.

The previous prime is 525440669641. The next prime is 525440669657. The reversal of 525440669645 is 546966044525.

It can be written as a sum of positive squares in 9 ways, for example, as 141103907044 + 384336762601 = 375638^2 + 619949^2 .

It is not a de Polignac number, because 525440669645 - 2² = 525440669641 is a prime.

It is a super-3 number, since 3×525440669645³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525440669641) 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 17 ways as a sum of consecutive naturals, for example, 27545171 + ... + 27564239.

It is an arithmetic number, because the mean of its divisors is an integer number (37213090039).

Almost surely, 2^525440669645 is an apocalyptic number.

It is an amenable number.

525440669645 is a deficient number, since it is larger than the sum of its proper divisors (144394951057).

525440669645 is an frugal number, since it uses more digits than its factorization.

525440669645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38177 (or 19091 counting only the distinct ones).

The product of its (nonzero) digits is 31104000, while the sum is 56.

The spelling of 525440669645 in words is "five hundred twenty-five billion, four hundred forty million, six hundred sixty-nine thousand, six hundred forty-five".