1256401423255 has 16 divisors (see below), whose sum is σ = 1644949620000. Its totient is φ = 913632079360.

The previous prime is 1256401423253. The next prime is 1256401423259. The reversal of 1256401423255 is 5523241046521.

It is not a de Polignac number, because 1256401423255 - 2¹ = 1256401423253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256401423253) 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, 985630 + ... + 1866619.

It is an arithmetic number, because the mean of its divisors is an integer number (102809351250).

Almost surely, 2^{1256401423255} is an apocalyptic number.

1256401423255 is a deficient number, since it is larger than the sum of its proper divisors (388548196745).

1256401423255 is a wasteful number, since it uses less digits than its factorization.

1256401423255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860274.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 1256401423255 its reverse (5523241046521), we get a palindrome (6779642469776).

The spelling of 1256401423255 in words is "one trillion, two hundred fifty-six billion, four hundred one million, four hundred twenty-three thousand, two hundred fifty-five".