256001266125201 has 4 divisors (see below), whose sum is σ = 341335021500272. Its totient is φ = 170667510750132.

The previous prime is 256001266125179. The next prime is 256001266125217. The reversal of 256001266125201 is 102521662100652.

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 not a de Polignac number, because 256001266125201 - 2¹⁵ = 256001266092433 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 256001266125201.

It is not an unprimeable number, because it can be changed into a prime (256001266125221) 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, 42666877687531 + ... + 42666877687536.

It is an arithmetic number, because the mean of its divisors is an integer number (85333755375068).

Almost surely, 2^{256001266125201} is an apocalyptic number.

It is an amenable number.

256001266125201 is a deficient number, since it is larger than the sum of its proper divisors (85333755375071).

256001266125201 is an equidigital number, since it uses as much as digits as its factorization.

256001266125201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85333755375070.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 256001266125201 in words is "two hundred fifty-six trillion, one billion, two hundred sixty-six million, one hundred twenty-five thousand, two hundred one".