42565551 has 8 divisors (see below), whose sum is σ = 64861824. Its totient is φ = 24323160.

The previous prime is 42565543. The next prime is 42565613. The reversal of 42565551 is 15556524.

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

It is not a de Polignac number, because 42565551 - 2³ = 42565543 is a prime.

It is a super-2 number, since 2×42565551² = 3623652263867202, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42565151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013445 + ... + 1013486.

It is an arithmetic number, because the mean of its divisors is an integer number (8107728).

Almost surely, 2^42565551 is an apocalyptic number.

42565551 is a deficient number, since it is larger than the sum of its proper divisors (22296273).

42565551 is a wasteful number, since it uses less digits than its factorization.

42565551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026941.

The product of its digits is 30000, while the sum is 33.

The square root of 42565551 is about 6524.2280003078. The cubic root of 42565551 is about 349.1559279479.

The spelling of 42565551 in words is "forty-two million, five hundred sixty-five thousand, five hundred fifty-one".