256019566853 has 2 divisors, whose sum is σ = 256019566854. Its totient is φ = 256019566852.

The previous prime is 256019566849. The next prime is 256019566927. The reversal of 256019566853 is 358665910652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237955669249 + 18063897604 = 487807^2 + 134402^2 .

It is a cyclic number.

It is not a de Polignac number, because 256019566853 - 2² = 256019566849 is a prime.

It is a super-2 number, since 2×256019566853² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256019562853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128009783426 + 128009783427.

It is an arithmetic number, because the mean of its divisors is an integer number (128009783427).

Almost surely, 2^256019566853 is an apocalyptic number.

It is an amenable number.

256019566853 is a deficient number, since it is larger than the sum of its proper divisors (1).

256019566853 is an equidigital number, since it uses as much as digits as its factorization.

256019566853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664000, while the sum is 56.

The spelling of 256019566853 in words is "two hundred fifty-six billion, nineteen million, five hundred sixty-six thousand, eight hundred fifty-three".