1256296422361 has 4 divisors (see below), whose sum is σ = 1272198908800. Its totient is φ = 1240393935924.

The previous prime is 1256296422257. The next prime is 1256296422379. The reversal of 1256296422361 is 1632246926521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256296422361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256296422391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7951243101 + ... + 7951243258.

It is an arithmetic number, because the mean of its divisors is an integer number (318049727200).

Almost surely, 2^{1256296422361} is an apocalyptic number.

It is an amenable number.

1256296422361 is a deficient number, since it is larger than the sum of its proper divisors (15902486439).

1256296422361 is an equidigital number, since it uses as much as digits as its factorization.

1256296422361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15902486438.

The product of its digits is 1866240, while the sum is 49.

The spelling of 1256296422361 in words is "one trillion, two hundred fifty-six billion, two hundred ninety-six million, four hundred twenty-two thousand, three hundred sixty-one".