256123535215 has 8 divisors (see below), whose sum is σ = 308330187408. Its totient is φ = 204244198080.

The previous prime is 256123535207. The next prime is 256123535221. The reversal of 256123535215 is 512535321652.

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

It is not a de Polignac number, because 256123535215 - 2³ = 256123535207 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 81827041 + ... + 81830170.

It is an arithmetic number, because the mean of its divisors is an integer number (38541273426).

Almost surely, 2^256123535215 is an apocalyptic number.

256123535215 is a deficient number, since it is larger than the sum of its proper divisors (52206652193).

256123535215 is a wasteful number, since it uses less digits than its factorization.

256123535215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163657529.

The product of its digits is 270000, while the sum is 40.

Adding to 256123535215 its reverse (512535321652), we get a palindrome (768658856867).

The spelling of 256123535215 in words is "two hundred fifty-six billion, one hundred twenty-three million, five hundred thirty-five thousand, two hundred fifteen".