42545661 has 8 divisors (see below), whose sum is σ = 57258144. Its totient is φ = 28098480.

The previous prime is 42545647. The next prime is 42545663. The reversal of 42545661 is 16654524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42545661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42545663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65950 + ... + 66591.

It is an arithmetic number, because the mean of its divisors is an integer number (7157268).

Almost surely, 2^42545661 is an apocalyptic number.

It is an amenable number.

42545661 is a deficient number, since it is larger than the sum of its proper divisors (14712483).

42545661 is a wasteful number, since it uses less digits than its factorization.

42545661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132651.

The product of its digits is 28800, while the sum is 33.

The square root of 42545661 is about 6522.7035039161. The cubic root of 42545661 is about 349.1015350313.

The spelling of 42545661 in words is "forty-two million, five hundred forty-five thousand, six hundred sixty-one".