256278872653 has 2 divisors, whose sum is σ = 256278872654. Its totient is φ = 256278872652.

The previous prime is 256278872639. The next prime is 256278872659. The reversal of 256278872653 is 356278872652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249062879844 + 7215992809 = 499062^2 + 84947^2 .

It is a cyclic number.

It is not a de Polignac number, because 256278872653 - 2⁵ = 256278872621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256278872591 and 256278872600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256278872659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128139436326 + 128139436327.

It is an arithmetic number, because the mean of its divisors is an integer number (128139436327).

Almost surely, 2^256278872653 is an apocalyptic number.

It is an amenable number.

256278872653 is a deficient number, since it is larger than the sum of its proper divisors (1).

256278872653 is an equidigital number, since it uses as much as digits as its factorization.

256278872653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 61.

Subtracting 256278872653 from its reverse (356278872652), we obtain a palindrome (99999999999).

The spelling of 256278872653 in words is "two hundred fifty-six billion, two hundred seventy-eight million, eight hundred seventy-two thousand, six hundred fifty-three".