1256914781233 has 2 divisors, whose sum is σ = 1256914781234. Its totient is φ = 1256914781232.

The previous prime is 1256914781219. The next prime is 1256914781249. The reversal of 1256914781233 is 3321874196521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211610935824 + 45303845409 = 1100732^2 + 212847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256914781233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256914781263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628457390616 + 628457390617.

It is an arithmetic number, because the mean of its divisors is an integer number (628457390617).

Almost surely, 2^{1256914781233} is an apocalyptic number.

It is an amenable number.

1256914781233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256914781233 is an equidigital number, since it uses as much as digits as its factorization.

1256914781233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The spelling of 1256914781233 in words is "one trillion, two hundred fifty-six billion, nine hundred fourteen million, seven hundred eighty-one thousand, two hundred thirty-three".