671081813326080 has 576 divisors, whose sum is σ = 2564929842263040. Its totient is φ = 165167714304000.

The previous prime is 671081813326037. The next prime is 671081813326081. The reversal of 671081813326080 is 80623318180176.

It is a happy number.

671081813326080 is a `hidden beast` number, since 6 + 7 + 1 + 0 + 8 + 18 + 13 + 3 + 2 + 608 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (671081813326081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3572131350 + ... + 3572319210.

Almost surely, 2^{671081813326080} is an apocalyptic number.

671081813326080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671081813326080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282464921131520).

671081813326080 is an abundant number, since it is smaller than the sum of its proper divisors (1893848028936960).

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

671081813326080 is a wasteful number, since it uses less digits than its factorization.

671081813326080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195855 (or 195835 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 671081813326080 in words is "six hundred seventy-one trillion, eighty-one billion, eight hundred thirteen million, three hundred twenty-six thousand, eighty".