671344617761 has 4 divisors (see below), whose sum is σ = 671461643652. Its totient is φ = 671227591872.

The previous prime is 671344617733. The next prime is 671344617767. The reversal of 671344617761 is 167716443176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4050049600 + 667294568161 = 63640^2 + 816881^2 .

It is a cyclic number.

It is not a de Polignac number, because 671344617761 - 2²⁶ = 671277508897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671344617767) 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, 58504340 + ... + 58515813.

It is an arithmetic number, because the mean of its divisors is an integer number (167865410913).

Almost surely, 2^671344617761 is an apocalyptic number.

It is an amenable number.

671344617761 is a deficient number, since it is larger than the sum of its proper divisors (117025891).

671344617761 is a wasteful number, since it uses less digits than its factorization.

671344617761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117025890.

The product of its digits is 3556224, while the sum is 53.

The spelling of 671344617761 in words is "six hundred seventy-one billion, three hundred forty-four million, six hundred seventeen thousand, seven hundred sixty-one".