256887432266 has 4 divisors (see below), whose sum is σ = 385331148402. Its totient is φ = 128443716132.

The previous prime is 256887432247. The next prime is 256887432281. The reversal of 256887432266 is 662234788652.

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

It can be written as a sum of positive squares in only one way, i.e., 176555434225 + 80331998041 = 420185^2 + 283429^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64221858065 + ... + 64221858068.

Almost surely, 2^256887432266 is an apocalyptic number.

256887432266 is a deficient number, since it is larger than the sum of its proper divisors (128443716136).

256887432266 is a wasteful number, since it uses less digits than its factorization.

256887432266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128443716135.

The product of its digits is 46448640, while the sum is 59.

The spelling of 256887432266 in words is "two hundred fifty-six billion, eight hundred eighty-seven million, four hundred thirty-two thousand, two hundred sixty-six".