256400653305 has 8 divisors (see below), whose sum is σ = 410241045312. Its totient is φ = 136747015088.

The previous prime is 256400653283. The next prime is 256400653343. The reversal of 256400653305 is 503356004652.

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 256400653305 - 2¹¹ = 256400651257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8546688429 + ... + 8546688458.

It is an arithmetic number, because the mean of its divisors is an integer number (51280130664).

Almost surely, 2^256400653305 is an apocalyptic number.

It is an amenable number.

256400653305 is a deficient number, since it is larger than the sum of its proper divisors (153840392007).

256400653305 is a wasteful number, since it uses less digits than its factorization.

256400653305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17093376895.

The product of its (nonzero) digits is 324000, while the sum is 39.

Adding to 256400653305 its reverse (503356004652), we get a palindrome (759756657957).

The spelling of 256400653305 in words is "two hundred fifty-six billion, four hundred million, six hundred fifty-three thousand, three hundred five".