256999118 has 4 divisors (see below), whose sum is σ = 385498680. Its totient is φ = 128499558.

The previous prime is 256999117. The next prime is 256999121. The reversal of 256999118 is 811999652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256999117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64249778 + ... + 64249781.

It is an arithmetic number, because the mean of its divisors is an integer number (96374670).

Almost surely, 2^256999118 is an apocalyptic number.

256999118 is a deficient number, since it is larger than the sum of its proper divisors (128499562).

256999118 is a wasteful number, since it uses less digits than its factorization.

256999118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128499561.

The product of its digits is 349920, while the sum is 50.

The square root of 256999118 is about 16031.1920330336. The cubic root of 256999118 is about 635.7853906531.

The spelling of 256999118 in words is "two hundred fifty-six million, nine hundred ninety-nine thousand, one hundred eighteen".