671318943545 has 8 divisors (see below), whose sum is σ = 806068911624. Its totient is φ = 536731035264.

The previous prime is 671318943539. The next prime is 671318943551. The reversal of 671318943545 is 545349813176.

It is an interprime number because it is at equal distance from previous prime (671318943539) and next prime (671318943551).

It can be written as a sum of positive squares in 4 ways, for example, as 41741758864 + 629577184681 = 204308^2 + 793459^2 .

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 671318943545 - 2²⁰ = 671317894969 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, 40505834 + ... + 40522403.

It is an arithmetic number, because the mean of its divisors is an integer number (100758613953).

Almost surely, 2^671318943545 is an apocalyptic number.

It is an amenable number.

671318943545 is a deficient number, since it is larger than the sum of its proper divisors (134749968079).

671318943545 is a wasteful number, since it uses less digits than its factorization.

671318943545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81029899.

The product of its digits is 10886400, while the sum is 56.

The spelling of 671318943545 in words is "six hundred seventy-one billion, three hundred eighteen million, nine hundred forty-three thousand, five hundred forty-five".