256341766166 has 4 divisors (see below), whose sum is σ = 384512649252. Its totient is φ = 128170883082.

The previous prime is 256341766129. The next prime is 256341766199. The reversal of 256341766166 is 661667143652.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×256341766166² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64085441540 + ... + 64085441543.

It is an arithmetic number, because the mean of its divisors is an integer number (96128162313).

Almost surely, 2^256341766166 is an apocalyptic number.

256341766166 is a deficient number, since it is larger than the sum of its proper divisors (128170883086).

256341766166 is a wasteful number, since it uses less digits than its factorization.

256341766166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128170883085.

The product of its digits is 6531840, while the sum is 53.

The spelling of 256341766166 in words is "two hundred fifty-six billion, three hundred forty-one million, seven hundred sixty-six thousand, one hundred sixty-six".