671653841863546 has 8 divisors (see below), whose sum is σ = 1007493394913460. Its totient is φ = 335822710225728.

The previous prime is 671653841863523. The next prime is 671653841863559. The reversal of 671653841863546 is 645368148356176.

It can be written as a sum of positive squares in 2 ways, for example, as 666007700765625 + 5646141097921 = 25807125^2 + 2376161^2 .

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

It is a super-2 number, since 2×671653841863546² (a number of 30 digits) contains 22 as substring.

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, 2105153631 + ... + 2105472658.

Almost surely, 2^{671653841863546} is an apocalyptic number.

671653841863546 is a deficient number, since it is larger than the sum of its proper divisors (335839553049914).

671653841863546 is a wasteful number, since it uses less digits than its factorization.

671653841863546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210706048.

The product of its digits is 2090188800, while the sum is 73.

The spelling of 671653841863546 in words is "six hundred seventy-one trillion, six hundred fifty-three billion, eight hundred forty-one million, eight hundred sixty-three thousand, five hundred forty-six".