42661559 has 4 divisors (see below), whose sum is σ = 42705600. Its totient is φ = 42617520.

The previous prime is 42661537. The next prime is 42661589. The reversal of 42661559 is 95516624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42661559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42661589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20534 + ... + 22515.

It is an arithmetic number, because the mean of its divisors is an integer number (10676400).

Almost surely, 2^42661559 is an apocalyptic number.

42661559 is a deficient number, since it is larger than the sum of its proper divisors (44041).

42661559 is an equidigital number, since it uses as much as digits as its factorization.

42661559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44040.

The product of its digits is 64800, while the sum is 38.

The square root of 42661559 is about 6531.5816614355. The cubic root of 42661559 is about 349.4182417199.

The spelling of 42661559 in words is "forty-two million, six hundred sixty-one thousand, five hundred fifty-nine".