671920877408256 has 624 divisors, whose sum is σ = 2302111293640704. Its totient is φ = 191825209884672.

The previous prime is 671920877408233. The next prime is 671920877408351. The reversal of 671920877408256 is 652804778029176.

It is a happy number.

671920877408256 is a `hidden beast` number, since 6 + 7 + 1 + 9 + 208 + 7 + 7 + 408 + 2 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8939003185 + ... + 8939078351.

It is an arithmetic number, because the mean of its divisors is an integer number (3689280919296).

Almost surely, 2^{671920877408256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671920877408256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151055646820352).

671920877408256 is an abundant number, since it is smaller than the sum of its proper divisors (1630190416232448).

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

671920877408256 is an equidigital number, since it uses as much as digits as its factorization.

671920877408256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76496 (or 76462 counting only the distinct ones).

The product of its (nonzero) digits is 568995840, while the sum is 72.

The spelling of 671920877408256 in words is "six hundred seventy-one trillion, nine hundred twenty billion, eight hundred seventy-seven million, four hundred eight thousand, two hundred fifty-six".