256671871880 has 32 divisors (see below), whose sum is σ = 577527580800. Its totient is φ = 102665927616.

The previous prime is 256671871861. The next prime is 256671871931. The reversal of 256671871880 is 88178176652.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

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, 1991231 + ... + 2116209.

It is an arithmetic number, because the mean of its divisors is an integer number (18047736900).

Almost surely, 2^256671871880 is an apocalyptic number.

256671871880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256671871880 is an abundant number, since it is smaller than the sum of its proper divisors (320855708920).

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

256671871880 is a wasteful number, since it uses less digits than its factorization.

256671871880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176333 (or 176329 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 59.

The spelling of 256671871880 in words is "two hundred fifty-six billion, six hundred seventy-one million, eight hundred seventy-one thousand, eight hundred eighty".