665941525 has 6 divisors (see below), whose sum is σ = 825767522. Its totient is φ = 532753200.

The previous prime is 665941487. The next prime is 665941537. The reversal of 665941525 is 525149566.

665941525 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 52041796 + 613899729 = 7214^2 + 24777^2 .

It is a de Polignac number, because none of the positive numbers 2^k-665941525 is a prime.

It is a super-2 number, since 2×665941525² = 886956229438651250, which contains 22 as substring.

It is a Duffinian number.

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, 13318806 + ... + 13318855.

Almost surely, 2^665941525 is an apocalyptic number.

It is an amenable number.

665941525 is a deficient number, since it is larger than the sum of its proper divisors (159825997).

665941525 is a wasteful number, since it uses less digits than its factorization.

665941525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26637671 (or 26637666 counting only the distinct ones).

The product of its digits is 324000, while the sum is 43.

The square root of 665941525 is about 25805.8428461463. The cubic root of 665941525 is about 873.2636150310.

It can be divided in two parts, 6659 and 41525, that added together give a palindrome (48184).

The spelling of 665941525 in words is "six hundred sixty-five million, nine hundred forty-one thousand, five hundred twenty-five".