671837554816 has 16 divisors (see below), whose sum is σ = 1338426378990. Its totient is φ = 335918777344.

The previous prime is 671837554807. The next prime is 671837554837. The reversal of 671837554816 is 618455738176.

It can be written as a sum of positive squares in only one way, i.e., 415096718400 + 256740836416 = 644280^2 + 506696^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×671837554816² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2624365321 + ... + 2624365576.

Almost surely, 2^671837554816 is an apocalyptic number.

It is an amenable number.

671837554816 is a deficient number, since it is larger than the sum of its proper divisors (666588824174).

671837554816 is an equidigital number, since it uses as much as digits as its factorization.

671837554816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248730911 (or 5248730899 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 61.

The spelling of 671837554816 in words is "six hundred seventy-one billion, eight hundred thirty-seven million, five hundred fifty-four thousand, eight hundred sixteen".