256036677121 has 2 divisors, whose sum is σ = 256036677122. Its totient is φ = 256036677120.

The previous prime is 256036677107. The next prime is 256036677131. The reversal of 256036677121 is 121776630652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254459713600 + 1576963521 = 504440^2 + 39711^2 .

It is a cyclic number.

It is not a de Polignac number, because 256036677121 - 2²⁹ = 255499806209 is a prime.

It is not a weakly prime, because it can be changed into another prime (256036677101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128018338560 + 128018338561.

It is an arithmetic number, because the mean of its divisors is an integer number (128018338561).

Almost surely, 2^256036677121 is an apocalyptic number.

It is an amenable number.

256036677121 is a deficient number, since it is larger than the sum of its proper divisors (1).

256036677121 is an equidigital number, since it uses as much as digits as its factorization.

256036677121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 256036677121 in words is "two hundred fifty-six billion, thirty-six million, six hundred seventy-seven thousand, one hundred twenty-one".