671081274161 has 4 divisors (see below), whose sum is σ = 671155493232. Its totient is φ = 671007055092.

The previous prime is 671081274119. The next prime is 671081274211. The reversal of 671081274161 is 161472180176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671081274161 - 2²² = 671077079857 is a prime.

It is a super-3 number, since 3×671081274161³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671081279161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37095971 + ... + 37114056.

It is an arithmetic number, because the mean of its divisors is an integer number (167788873308).

Almost surely, 2^671081274161 is an apocalyptic number.

It is an amenable number.

671081274161 is a deficient number, since it is larger than the sum of its proper divisors (74219071).

671081274161 is an equidigital number, since it uses as much as digits as its factorization.

671081274161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74219070.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 671081274161 in words is "six hundred seventy-one billion, eighty-one million, two hundred seventy-four thousand, one hundred sixty-one".