42666631 has 4 divisors (see below), whose sum is σ = 48761872. Its totient is φ = 36571392.

The previous prime is 42666629. The next prime is 42666641. The reversal of 42666631 is 13666624.

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

It is a cyclic number.

It is not a de Polignac number, because 42666631 - 2¹ = 42666629 is a prime.

It is a super-2 number, since 2×42666631² = 3640882801780322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42666601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3047610 + ... + 3047623.

It is an arithmetic number, because the mean of its divisors is an integer number (12190468).

Almost surely, 2^42666631 is an apocalyptic number.

42666631 is a deficient number, since it is larger than the sum of its proper divisors (6095241).

42666631 is an equidigital number, since it uses as much as digits as its factorization.

42666631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6095240.

The product of its digits is 31104, while the sum is 34.

The square root of 42666631 is about 6531.9699172608. The cubic root of 42666631 is about 349.4320885267.

The spelling of 42666631 in words is "forty-two million, six hundred sixty-six thousand, six hundred thirty-one".