671823356305 has 8 divisors (see below), whose sum is σ = 806651098344. Its totient is φ = 537149971200.

The previous prime is 671823356287. The next prime is 671823356311. The reversal of 671823356305 is 503653328176.

671823356305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10425022609 + 661398333696 = 102103^2 + 813264^2 .

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

It is not a de Polignac number, because 671823356305 - 2¹⁹ = 671822832017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38579656 + ... + 38597065.

It is an arithmetic number, because the mean of its divisors is an integer number (100831387293).

Almost surely, 2^671823356305 is an apocalyptic number.

It is an amenable number.

671823356305 is a deficient number, since it is larger than the sum of its proper divisors (134827742039).

671823356305 is a wasteful number, since it uses less digits than its factorization.

671823356305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77178467.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 671823356305 in words is "six hundred seventy-one billion, eight hundred twenty-three million, three hundred fifty-six thousand, three hundred five".