665422671 has 8 divisors (see below), whose sum is σ = 887493760. Its totient is φ = 443483352.

The previous prime is 665422669. The next prime is 665422673. The reversal of 665422671 is 176224566.

It is an interprime number because it is at equal distance from previous prime (665422669) and next prime (665422673).

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

It is not a de Polignac number, because 665422671 - 2¹ = 665422669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665422673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20485 + ... + 41838.

It is an arithmetic number, because the mean of its divisors is an integer number (110936720).

Almost surely, 2^665422671 is an apocalyptic number.

665422671 is a deficient number, since it is larger than the sum of its proper divisors (222071089).

665422671 is a wasteful number, since it uses less digits than its factorization.

665422671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65885.

The product of its digits is 120960, while the sum is 39.

The square root of 665422671 is about 25795.7878538338. The cubic root of 665422671 is about 873.0367612572.

The spelling of 665422671 in words is "six hundred sixty-five million, four hundred twenty-two thousand, six hundred seventy-one".