42018566 has 4 divisors (see below), whose sum is σ = 63027852. Its totient is φ = 21009282.

The previous prime is 42018551. The next prime is 42018583. The reversal of 42018566 is 66581024.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10504640 + ... + 10504643.

It is an arithmetic number, because the mean of its divisors is an integer number (15756963).

Almost surely, 2^42018566 is an apocalyptic number.

42018566 is a deficient number, since it is larger than the sum of its proper divisors (21009286).

42018566 is a wasteful number, since it uses less digits than its factorization.

42018566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21009285.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42018566 is about 6482.1729381435. The cubic root of 42018566 is about 347.6538759202.

The spelling of 42018566 in words is "forty-two million, eighteen thousand, five hundred sixty-six".