671285576640 has 896 divisors, whose sum is σ = 2596373987328. Its totient is φ = 143712092160.

The previous prime is 671285576629. The next prime is 671285576659. The reversal of 671285576640 is 46675582176.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1227212847 + ... + 1227213393.

Almost surely, 2^671285576640 is an apocalyptic number.

671285576640 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 671285576640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1298186993664).

671285576640 is an abundant number, since it is smaller than the sum of its proper divisors (1925088410688).

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

671285576640 is a wasteful number, since it uses less digits than its factorization.

671285576640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 671285576640 in words is "six hundred seventy-one billion, two hundred eighty-five million, five hundred seventy-six thousand, six hundred forty".