42665537 has 4 divisors (see below), whose sum is σ = 42696240. Its totient is φ = 42634836.

The previous prime is 42665527. The next prime is 42665549. The reversal of 42665537 is 73556624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42665537 - 2⁶ = 42665473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42665537.

It is not an unprimeable number, because it can be changed into a prime (42665527) 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, 13163 + ... + 16080.

It is an arithmetic number, because the mean of its divisors is an integer number (10674060).

Almost surely, 2^42665537 is an apocalyptic number.

It is an amenable number.

42665537 is a deficient number, since it is larger than the sum of its proper divisors (30703).

42665537 is a wasteful number, since it uses less digits than its factorization.

42665537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30702.

The product of its digits is 151200, while the sum is 38.

The square root of 42665537 is about 6531.8861747584. The cubic root of 42665537 is about 349.4291019463.

The spelling of 42665537 in words is "forty-two million, six hundred sixty-five thousand, five hundred thirty-seven".