671606211578 has 8 divisors (see below), whose sum is σ = 1042147569780. Its totient is φ = 324223688320.

The previous prime is 671606211559. The next prime is 671606211583. The reversal of 671606211578 is 875112606176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 620034980929 + 51571230649 = 787423^2 + 227093^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5789708663 + ... + 5789708778.

Almost surely, 2^671606211578 is an apocalyptic number.

671606211578 is a deficient number, since it is larger than the sum of its proper divisors (370541358202).

671606211578 is a wasteful number, since it uses less digits than its factorization.

671606211578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11579417472.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 671606211578 in words is "six hundred seventy-one billion, six hundred six million, two hundred eleven thousand, five hundred seventy-eight".