671555085 has 16 divisors (see below), whose sum is σ = 1075577280. Its totient is φ = 357799680.

The previous prime is 671555083. The next prime is 671555089. The reversal of 671555085 is 580555176.

It is not a de Polignac number, because 671555085 - 2¹ = 671555083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671555083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7051 + ... + 37320.

It is an arithmetic number, because the mean of its divisors is an integer number (67223580).

Almost surely, 2^671555085 is an apocalyptic number.

It is an amenable number.

671555085 is a deficient number, since it is larger than the sum of its proper divisors (404022195).

671555085 is a wasteful number, since it uses less digits than its factorization.

671555085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45388.

The product of its (nonzero) digits is 210000, while the sum is 42.

The square root of 671555085 is about 25914.3798883940. The cubic root of 671555085 is about 875.7104803647.

Subtracting from 671555085 its reverse (580555176), we obtain a palindrome (90999909).

The spelling of 671555085 in words is "six hundred seventy-one million, five hundred fifty-five thousand, eighty-five".