256743546773601 has 16 divisors (see below), whose sum is σ = 343562748654528. Its totient is φ = 170543362584000.

The previous prime is 256743546773587. The next prime is 256743546773621. The reversal of 256743546773601 is 106377645347652.

It is not a de Polignac number, because 256743546773601 - 2⁶ = 256743546773537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256743546773621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141909271 + ... + 143707091.

It is an arithmetic number, because the mean of its divisors is an integer number (21472671790908).

Almost surely, 2^{256743546773601} is an apocalyptic number.

It is an amenable number.

256743546773601 is a deficient number, since it is larger than the sum of its proper divisors (86819201880927).

256743546773601 is a wasteful number, since it uses less digits than its factorization.

256743546773601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969952.

The product of its (nonzero) digits is 533433600, while the sum is 66.

The spelling of 256743546773601 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred forty-six million, seven hundred seventy-three thousand, six hundred one".