1665241525 has 6 divisors (see below), whose sum is σ = 2064899522. Its totient is φ = 1332193200.

The previous prime is 1665241519. The next prime is 1665241619. The reversal of 1665241525 is 5251425661.

It can be written as a sum of positive squares in 3 ways, for example, as 30276 + 1665211249 = 174^2 + 40807^2 .

It is not a de Polignac number, because 1665241525 - 2⁵ = 1665241493 is a prime.

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, 33304806 + ... + 33304855.

Almost surely, 2^1665241525 is an apocalyptic number.

It is an amenable number.

1665241525 is a deficient number, since it is larger than the sum of its proper divisors (399657997).

1665241525 is an equidigital number, since it uses as much as digits as its factorization.

1665241525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66609671 (or 66609666 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 1665241525 is about 40807.3709640795. The cubic root of 1665241525 is about 1185.2930666721.

The spelling of 1665241525 in words is "one billion, six hundred sixty-five million, two hundred forty-one thousand, five hundred twenty-five".