671878116013 has 8 divisors (see below), whose sum is σ = 748511429400. Its totient is φ = 598809142848.

The previous prime is 671878116011. The next prime is 671878116059. The reversal of 671878116013 is 310611878176.

671878116013 = 579602² + 579603².

It can be written as a sum of positive squares in 4 ways, for example, as 111300969924 + 560577146089 = 333618^2 + 748717^2 .

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 671878116013 - 2¹ = 671878116011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671878116011) 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, 891084658 + ... + 891085411.

It is an arithmetic number, because the mean of its divisors is an integer number (93563928675).

Almost surely, 2^671878116013 is an apocalyptic number.

671878116013 is the 579603-rd centered square number.

It is an amenable number.

671878116013 is a deficient number, since it is larger than the sum of its proper divisors (76633313387).

671878116013 is a wasteful number, since it uses less digits than its factorization.

671878116013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782170111.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 671878116013 in words is "six hundred seventy-one billion, eight hundred seventy-eight million, one hundred sixteen thousand, thirteen".