671716105521 has 8 divisors (see below), whose sum is σ = 895768009440. Its totient is φ = 447737469312.

The previous prime is 671716105507. The next prime is 671716105531. The reversal of 671716105521 is 125501617176.

671716105521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 671716105521 - 2²¹ = 671714008369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671716105531) 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, 18295531 + ... + 18332208.

It is an arithmetic number, because the mean of its divisors is an integer number (111971001180).

Almost surely, 2^671716105521 is an apocalyptic number.

It is an amenable number.

671716105521 is a deficient number, since it is larger than the sum of its proper divisors (224051903919).

671716105521 is a wasteful number, since it uses less digits than its factorization.

671716105521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36633855.

The product of its (nonzero) digits is 88200, while the sum is 42.

The spelling of 671716105521 in words is "six hundred seventy-one billion, seven hundred sixteen million, one hundred five thousand, five hundred twenty-one".