42536666 has 8 divisors (see below), whose sum is σ = 63924564. Its totient is φ = 21228480.

The previous prime is 42536657. The next prime is 42536671. The reversal of 42536666 is 66663524.

It can be written as a sum of positive squares in 2 ways, for example, as 42523441 + 13225 = 6521^2 + 115^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18575 + ... + 20738.

Almost surely, 2^42536666 is an apocalyptic number.

42536666 is a deficient number, since it is larger than the sum of its proper divisors (21387898).

42536666 is a wasteful number, since it uses less digits than its factorization.

42536666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39856.

The product of its digits is 155520, while the sum is 38.

The square root of 42536666 is about 6522.0139527603. The cubic root of 42536666 is about 349.0769309584.

The spelling of 42536666 in words is "forty-two million, five hundred thirty-six thousand, six hundred sixty-six".