256435898849 has 16 divisors (see below), whose sum is σ = 278233233600. Its totient is φ = 234936987840.

The previous prime is 256435898843. The next prime is 256435898857. The reversal of 256435898849 is 948898534652.

It is a cyclic number.

It is not a de Polignac number, because 256435898849 - 2¹² = 256435894753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256435898843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2449394 + ... + 2551940.

It is an arithmetic number, because the mean of its divisors is an integer number (17389577100).

Almost surely, 2^256435898849 is an apocalyptic number.

It is an amenable number.

256435898849 is a deficient number, since it is larger than the sum of its proper divisors (21797334751).

256435898849 is a wasteful number, since it uses less digits than its factorization.

256435898849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104000.

The product of its digits is 597196800, while the sum is 71.

The spelling of 256435898849 in words is "two hundred fifty-six billion, four hundred thirty-five million, eight hundred ninety-eight thousand, eight hundred forty-nine".