256129771848 has 16 divisors (see below), whose sum is σ = 640324429680. Its totient is φ = 85376590608.

The previous prime is 256129771847. The next prime is 256129771853. The reversal of 256129771848 is 848177921652.

It is a junction number, because it is equal to n+sod(n) for n = 256129771791 and 256129771800.

It is not an unprimeable number, because it can be changed into a prime (256129771847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5336036890 + ... + 5336036937.

It is an arithmetic number, because the mean of its divisors is an integer number (40020276855).

Almost surely, 2^256129771848 is an apocalyptic number.

It is an amenable number.

256129771848 is an abundant number, since it is smaller than the sum of its proper divisors (384194657832).

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

256129771848 is a wasteful number, since it uses less digits than its factorization.

256129771848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672073836 (or 10672073832 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 60.

The spelling of 256129771848 in words is "two hundred fifty-six billion, one hundred twenty-nine million, seven hundred seventy-one thousand, eight hundred forty-eight".