256636343376 has 120 divisors (see below), whose sum is σ = 821451780864. Its totient is φ = 73269031680.

The previous prime is 256636343333. The next prime is 256636343429. The reversal of 256636343376 is 673343636652.

256636343376 is a `hidden beast` number, since 2 + 566 + 3 + 6 + 3 + 4 + 3 + 3 + 76 = 666.

256636343376 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×256636343376³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1241686 + ... + 1433546.

Almost surely, 2^256636343376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256636343376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410725890432).

256636343376 is an abundant number, since it is smaller than the sum of its proper divisors (564815437488).

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

256636343376 is a wasteful number, since it uses less digits than its factorization.

256636343376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193209 (or 193200 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 54.

The spelling of 256636343376 in words is "two hundred fifty-six billion, six hundred thirty-six million, three hundred forty-three thousand, three hundred seventy-six".