256398731443 has 8 divisors (see below), whose sum is σ = 265247096400. Its totient is φ = 247550835168.

The previous prime is 256398731441. The next prime is 256398731453. The reversal of 256398731443 is 344137893652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256398731443 - 2¹ = 256398731441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256398731441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1277280 + ... + 1464322.

It is an arithmetic number, because the mean of its divisors is an integer number (33155887050).

Almost surely, 2^256398731443 is an apocalyptic number.

256398731443 is a deficient number, since it is larger than the sum of its proper divisors (8848364957).

256398731443 is a wasteful number, since it uses less digits than its factorization.

256398731443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234341.

The product of its digits is 13063680, while the sum is 55.

The spelling of 256398731443 in words is "two hundred fifty-six billion, three hundred ninety-eight million, seven hundred thirty-one thousand, four hundred forty-three".