256838329853 has 16 divisors (see below), whose sum is σ = 295642218240. Its totient is φ = 218564925696.

The previous prime is 256838329843. The next prime is 256838329897. The reversal of 256838329853 is 358923838652.

It is a cyclic number.

It is not a de Polignac number, because 256838329853 - 2⁴ = 256838329837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256838329823) 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, 1248533 + ... + 1439621.

It is an arithmetic number, because the mean of its divisors is an integer number (18477638640).

Almost surely, 2^256838329853 is an apocalyptic number.

It is an amenable number.

256838329853 is a deficient number, since it is larger than the sum of its proper divisors (38803888387).

256838329853 is a wasteful number, since it uses less digits than its factorization.

256838329853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192476.

The product of its digits is 74649600, while the sum is 62.

The spelling of 256838329853 in words is "two hundred fifty-six billion, eight hundred thirty-eight million, three hundred twenty-nine thousand, eight hundred fifty-three".