42606665 has 8 divisors (see below), whose sum is σ = 51167688. Its totient is φ = 34058880.

The previous prime is 42606659. The next prime is 42606677. The reversal of 42606665 is 56660624.

It can be written as a sum of positive squares in 4 ways, for example, as 2866249 + 39740416 = 1693^2 + 6304^2 .

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

It is not a de Polignac number, because 42606665 - 2⁸ = 42606409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6335 + ... + 11195.

It is an arithmetic number, because the mean of its divisors is an integer number (6395961).

Almost surely, 2^42606665 is an apocalyptic number.

It is an amenable number.

42606665 is a deficient number, since it is larger than the sum of its proper divisors (8561023).

42606665 is a wasteful number, since it uses less digits than its factorization.

42606665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 42606665 is about 6527.3781106965. The cubic root of 42606665 is about 349.2683081636.

The spelling of 42606665 in words is "forty-two million, six hundred six thousand, six hundred sixty-five".