671959895 has 4 divisors (see below), whose sum is σ = 806351880. Its totient is φ = 537567912.

The previous prime is 671959891. The next prime is 671959907. The reversal of 671959895 is 598959176.

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 671959895 - 2² = 671959891 is a prime.

It is a super-2 number, since 2×671959895² = 903060200976822050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671959891) 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, 67195985 + ... + 67195994.

It is an arithmetic number, because the mean of its divisors is an integer number (201587970).

Almost surely, 2^671959895 is an apocalyptic number.

671959895 is a deficient number, since it is larger than the sum of its proper divisors (134391985).

671959895 is a wasteful number, since it uses less digits than its factorization.

671959895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134391984.

The product of its digits is 6123600, while the sum is 59.

The square root of 671959895 is about 25922.1892401086. The cubic root of 671959895 is about 875.8864029667.

The spelling of 671959895 in words is "six hundred seventy-one million, nine hundred fifty-nine thousand, eight hundred ninety-five".