671871771702820 has 48 divisors (see below), whose sum is σ = 1521508892198400. Its totient is φ = 247741847127936.

The previous prime is 671871771702763. The next prime is 671871771702869. The reversal of 671871771702820 is 28207177178176.

It is a super-2 number, since 2×671871771702820² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1738785420 + ... + 1739171779.

It is an arithmetic number, because the mean of its divisors is an integer number (31698101920800).

Almost surely, 2^{671871771702820} is an apocalyptic number.

It is an amenable number.

671871771702820 is an abundant number, since it is smaller than the sum of its proper divisors (849637120495580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671871771702820 is a wasteful number, since it uses less digits than its factorization.

671871771702820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3477957964 (or 3477957962 counting only the distinct ones).

The product of its (nonzero) digits is 25815552, while the sum is 64.

The spelling of 671871771702820 in words is "six hundred seventy-one trillion, eight hundred seventy-one billion, seven hundred seventy-one million, seven hundred two thousand, eight hundred twenty".