42545565 has 12 divisors (see below), whose sum is σ = 73745724. Its totient is φ = 22690944.

The previous prime is 42545557. The next prime is 42545593. The reversal of 42545565 is 56554524.

42545565 is a `hidden beast` number, since 42 + 54 + 5 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 37970244 = 2139^2 + 6162^2 .

It is not a de Polignac number, because 42545565 - 2³ = 42545557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472684 + ... + 472773.

It is an arithmetic number, because the mean of its divisors is an integer number (6145477).

Almost surely, 2^42545565 is an apocalyptic number.

42545565 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42545565 is a deficient number, since it is larger than the sum of its proper divisors (31200159).

42545565 is a wasteful number, since it uses less digits than its factorization.

42545565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945468 (or 945465 counting only the distinct ones).

The product of its digits is 120000, while the sum is 36.

The square root of 42545565 is about 6522.6961450002. The cubic root of 42545565 is about 349.1012724603.

The spelling of 42545565 in words is "forty-two million, five hundred forty-five thousand, five hundred sixty-five".