256402412449 has 2 divisors, whose sum is σ = 256402412450. Its totient is φ = 256402412448.

The previous prime is 256402412423. The next prime is 256402412489. The reversal of 256402412449 is 944214204652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168750888849 + 87651523600 = 410793^2 + 296060^2 .

It is a cyclic number.

It is not a de Polignac number, because 256402412449 - 2²⁹ = 255865541537 is a prime.

It is a super-2 number, since 2×256402412449² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256402412489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128201206224 + 128201206225.

It is an arithmetic number, because the mean of its divisors is an integer number (128201206225).

Almost surely, 2^256402412449 is an apocalyptic number.

It is an amenable number.

256402412449 is a deficient number, since it is larger than the sum of its proper divisors (1).

256402412449 is an equidigital number, since it uses as much as digits as its factorization.

256402412449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 256402412449 in words is "two hundred fifty-six billion, four hundred two million, four hundred twelve thousand, four hundred forty-nine".