42665651 has 4 divisors (see below), whose sum is σ = 48760752. Its totient is φ = 36570552.

The previous prime is 42665627. The next prime is 42665663. The reversal of 42665651 is 15656624.

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 42665651 - 2²² = 38471347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42665611) 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, 3047540 + ... + 3047553.

It is an arithmetic number, because the mean of its divisors is an integer number (12190188).

Almost surely, 2^42665651 is an apocalyptic number.

42665651 is a deficient number, since it is larger than the sum of its proper divisors (6095101).

42665651 is an equidigital number, since it uses as much as digits as its factorization.

42665651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095100.

The product of its digits is 43200, while the sum is 35.

The square root of 42665651 is about 6531.8949011753. The cubic root of 42665651 is about 349.4294131645.

The spelling of 42665651 in words is "forty-two million, six hundred sixty-five thousand, six hundred fifty-one".