671944300261 has 8 divisors (see below), whose sum is σ = 726738044760. Its totient is φ = 617594230272.

The previous prime is 671944300229. The next prime is 671944300289. The reversal of 671944300261 is 162003449176.

It can be written as a sum of positive squares in 4 ways, for example, as 8745803361 + 663198496900 = 93519^2 + 814370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671944300261 - 2⁵ = 671944300229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671944300201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110915476 + ... + 110921533.

It is an arithmetic number, because the mean of its divisors is an integer number (90842255595).

Almost surely, 2^671944300261 is an apocalyptic number.

It is an amenable number.

671944300261 is a deficient number, since it is larger than the sum of its proper divisors (54793744499).

671944300261 is a wasteful number, since it uses less digits than its factorization.

671944300261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221837255.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 671944300261 in words is "six hundred seventy-one billion, nine hundred forty-four million, three hundred thousand, two hundred sixty-one".