671555169 has 12 divisors (see below), whose sum is σ = 986466000. Its totient is φ = 440114904.

The previous prime is 671555147. The next prime is 671555177. The reversal of 671555169 is 961555176.

It is not a de Polignac number, because 671555169 - 2⁷ = 671555041 is a prime.

It is a super-2 number, since 2×671555169² = 901972690021237122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671555189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631819 + ... + 632880.

It is an arithmetic number, because the mean of its divisors is an integer number (82205500).

Almost surely, 2^671555169 is an apocalyptic number.

It is an amenable number.

671555169 is a deficient number, since it is larger than the sum of its proper divisors (314910831).

671555169 is a wasteful number, since it uses less digits than its factorization.

671555169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264764 (or 1264761 counting only the distinct ones).

The product of its digits is 283500, while the sum is 45.

The square root of 671555169 is about 25914.3815091157. The cubic root of 671555169 is about 875.7105168768.

The spelling of 671555169 in words is "six hundred seventy-one million, five hundred fifty-five thousand, one hundred sixty-nine".