256744350215005 has 16 divisors (see below), whose sum is σ = 321489156216960. Its totient is φ = 196464888341568.

The previous prime is 256744350214973. The next prime is 256744350215047. The reversal of 256744350215005 is 500512053447652.

It is a cyclic number.

It is not a de Polignac number, because 256744350215005 - 2⁵ = 256744350214973 is a prime.

It is a super-2 number, since 2×256744350215005² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256744350215005.

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, 74926714 + ... + 78278356.

It is an arithmetic number, because the mean of its divisors is an integer number (20093072263560).

Almost surely, 2^{256744350215005} is an apocalyptic number.

It is an amenable number.

256744350215005 is a deficient number, since it is larger than the sum of its proper divisors (64744806001955).

256744350215005 is a wasteful number, since it uses less digits than its factorization.

256744350215005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017780.

The product of its (nonzero) digits is 5040000, while the sum is 49.

The spelling of 256744350215005 in words is "two hundred fifty-six trillion, seven hundred forty-four billion, three hundred fifty million, two hundred fifteen thousand, five".