256551423315 has 64 divisors (see below), whose sum is σ = 489434959872. Its totient is φ = 113295052800.

The previous prime is 256551423203. The next prime is 256551423433. The reversal of 256551423315 is 513324155652.

It is not a de Polignac number, because 256551423315 - 2¹¹ = 256551421267 is a prime.

It is a super-3 number, since 3×256551423315³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1388242 + ... + 1562151.

It is an arithmetic number, because the mean of its divisors is an integer number (7647421248).

Almost surely, 2^256551423315 is an apocalyptic number.

256551423315 is a deficient number, since it is larger than the sum of its proper divisors (232883536557).

256551423315 is a wasteful number, since it uses less digits than its factorization.

256551423315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950460.

The product of its digits is 540000, while the sum is 42.

Adding to 256551423315 its reverse (513324155652), we get a palindrome (769875578967).

The spelling of 256551423315 in words is "two hundred fifty-six billion, five hundred fifty-one million, four hundred twenty-three thousand, three hundred fifteen".