256402151117 has 16 divisors (see below), whose sum is σ = 296285278080. Its totient is φ = 217340304192.

The previous prime is 256402151077. The next prime is 256402151149. The reversal of 256402151117 is 711151204652.

It is a cyclic number.

It is not a de Polignac number, because 256402151117 - 2¹² = 256402147021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256402151017) 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, 77783 + ... + 720315.

It is an arithmetic number, because the mean of its divisors is an integer number (18517829880).

Almost surely, 2^256402151117 is an apocalyptic number.

It is an amenable number.

256402151117 is a deficient number, since it is larger than the sum of its proper divisors (39883126963).

256402151117 is a wasteful number, since it uses less digits than its factorization.

256402151117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643172.

The product of its (nonzero) digits is 16800, while the sum is 35.

Adding to 256402151117 its reverse (711151204652), we get a palindrome (967553355769).

The spelling of 256402151117 in words is "two hundred fifty-six billion, four hundred two million, one hundred fifty-one thousand, one hundred seventeen".