256507244171527 has 4 divisors (see below), whose sum is σ = 256519064258856. Its totient is φ = 256495424084200.

The previous prime is 256507244171441. The next prime is 256507244171539. The reversal of 256507244171527 is 725171442705652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256507244171527 is a prime.

It is a super-2 number, since 2×256507244171527² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256507244171327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5910011113 + ... + 5910054514.

It is an arithmetic number, because the mean of its divisors is an integer number (64129766064714).

Almost surely, 2^{256507244171527} is an apocalyptic number.

256507244171527 is a deficient number, since it is larger than the sum of its proper divisors (11820087329).

256507244171527 is a wasteful number, since it uses less digits than its factorization.

256507244171527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11820087328.

The product of its (nonzero) digits is 32928000, while the sum is 58.

The spelling of 256507244171527 in words is "two hundred fifty-six trillion, five hundred seven billion, two hundred forty-four million, one hundred seventy-one thousand, five hundred twenty-seven".