256516502344015 has 16 divisors (see below), whose sum is σ = 321577780801536. Its totient is φ = 196200729338400.

The previous prime is 256516502344007. The next prime is 256516502344057. The reversal of 256516502344015 is 510443205615652.

It is not a de Polignac number, because 256516502344015 - 2³ = 256516502344007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256516502344015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9969536391 + ... + 9969562120.

It is an arithmetic number, because the mean of its divisors is an integer number (20098611300096).

Almost surely, 2^{256516502344015} is an apocalyptic number.

256516502344015 is a deficient number, since it is larger than the sum of its proper divisors (65061278457521).

256516502344015 is a wasteful number, since it uses less digits than its factorization.

256516502344015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19939098630.

The product of its (nonzero) digits is 4320000, while the sum is 49.

Adding to 256516502344015 its reverse (510443205615652), we get a palindrome (766959707959667).

The spelling of 256516502344015 in words is "two hundred fifty-six trillion, five hundred sixteen billion, five hundred two million, three hundred forty-four thousand, fifteen".