256136213446 has 8 divisors (see below), whose sum is σ = 384206773320. Its totient is φ = 128067289008.

The previous prime is 256136213423. The next prime is 256136213449. The reversal of 256136213446 is 644312631652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256136213449) 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, 118965 + ... + 725551.

It is an arithmetic number, because the mean of its divisors is an integer number (48025846665).

Almost surely, 2^256136213446 is an apocalyptic number.

256136213446 is a deficient number, since it is larger than the sum of its proper divisors (128070559874).

256136213446 is a wasteful number, since it uses less digits than its factorization.

256136213446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817718.

The product of its digits is 622080, while the sum is 43.

The spelling of 256136213446 in words is "two hundred fifty-six billion, one hundred thirty-six million, two hundred thirteen thousand, four hundred forty-six".