42665816 has 8 divisors (see below), whose sum is σ = 79998420. Its totient is φ = 21332904.

The previous prime is 42665807. The next prime is 42665867. The reversal of 42665816 is 61856624.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 42665816.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2666606 + ... + 2666621.

Almost surely, 2^42665816 is an apocalyptic number.

It is an amenable number.

42665816 is a deficient number, since it is larger than the sum of its proper divisors (37332604).

42665816 is a wasteful number, since it uses less digits than its factorization.

42665816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333233 (or 5333229 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 42665816 is about 6531.9075314949. The cubic root of 42665816 is about 349.4298636110.

The spelling of 42665816 in words is "forty-two million, six hundred sixty-five thousand, eight hundred sixteen".