256743503712771 has 4 divisors (see below), whose sum is σ = 342324671617032. Its totient is φ = 171162335808512.

The previous prime is 256743503712767. The next prime is 256743503712799. The reversal of 256743503712771 is 177217305347652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256743503712771 - 2² = 256743503712767 is a prime.

It is a super-3 number, since 3×256743503712771³ (a number of 44 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (256743503713771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42790583952126 + ... + 42790583952131.

It is an arithmetic number, because the mean of its divisors is an integer number (85581167904258).

Almost surely, 2^{256743503712771} is an apocalyptic number.

256743503712771 is a deficient number, since it is larger than the sum of its proper divisors (85581167904261).

256743503712771 is an equidigital number, since it uses as much as digits as its factorization.

256743503712771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85581167904260.

The product of its (nonzero) digits is 51861600, while the sum is 60.

The spelling of 256743503712771 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred three million, seven hundred twelve thousand, seven hundred seventy-one".