256516021241153 has 4 divisors (see below), whose sum is σ = 256517147808768. Its totient is φ = 256514894673540.

The previous prime is 256516021241101. The next prime is 256516021241209. The reversal of 256516021241153 is 351142120615652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256516021241153 - 2²⁰ = 256516020192577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256516021241453) 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, 562942193 + ... + 563397678.

It is an arithmetic number, because the mean of its divisors is an integer number (64129286952192).

Almost surely, 2^{256516021241153} is an apocalyptic number.

It is an amenable number.

256516021241153 is a deficient number, since it is larger than the sum of its proper divisors (1126567615).

256516021241153 is a wasteful number, since it uses less digits than its factorization.

256516021241153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126567614.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 256516021241153 in words is "two hundred fifty-six trillion, five hundred sixteen billion, twenty-one million, two hundred forty-one thousand, one hundred fifty-three".