671665095 has 16 divisors (see below), whose sum is σ = 1194071520. Its totient is φ = 358221312.

The previous prime is 671665091. The next prime is 671665147. The reversal of 671665095 is 590566176.

It is not a de Polignac number, because 671665095 - 2² = 671665091 is a prime.

It is a super-2 number, since 2×671665095² = 902267999682718050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 671665095.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671665091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2487514 + ... + 2487783.

It is an arithmetic number, because the mean of its divisors is an integer number (74629470).

Almost surely, 2^671665095 is an apocalyptic number.

671665095 is a deficient number, since it is larger than the sum of its proper divisors (522406425).

671665095 is a wasteful number, since it uses less digits than its factorization.

671665095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975311 (or 4975305 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 671665095 is about 25916.5023681823. The cubic root of 671665095 is about 875.7582955786.

The spelling of 671665095 in words is "six hundred seventy-one million, six hundred sixty-five thousand, ninety-five".