671209109252736 has 64 divisors (see below), whose sum is σ = 1801279600639680. Its totient is φ = 221429809225728.

The previous prime is 671209109252723. The next prime is 671209109252743. The reversal of 671209109252736 is 637252901902176.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 671209109252736.

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, 9009964756 + ... + 9010039251.

It is an arithmetic number, because the mean of its divisors is an integer number (28144993759995).

Almost surely, 2^{671209109252736} is an apocalyptic number.

It is an amenable number.

671209109252736 is an abundant number, since it is smaller than the sum of its proper divisors (1130070491386944).

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

671209109252736 is a wasteful number, since it uses less digits than its factorization.

671209109252736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18020004121 (or 18020004109 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 60.

The spelling of 671209109252736 in words is "six hundred seventy-one trillion, two hundred nine billion, one hundred nine million, two hundred fifty-two thousand, seven hundred thirty-six".