1256204608213 has 4 divisors (see below), whose sum is σ = 1257951764160. Its totient is φ = 1254457452268.

The previous prime is 1256204608201. The next prime is 1256204608259. The reversal of 1256204608213 is 3128064026521.

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 not a de Polignac number, because 1256204608213 - 2²¹ = 1256202511061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256204608913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873576895 + ... + 873578332.

It is an arithmetic number, because the mean of its divisors is an integer number (314487941040).

Almost surely, 2^{1256204608213} is an apocalyptic number.

It is an amenable number.

1256204608213 is a deficient number, since it is larger than the sum of its proper divisors (1747155947).

1256204608213 is an equidigital number, since it uses as much as digits as its factorization.

1256204608213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747155946.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 1256204608213 in words is "one trillion, two hundred fifty-six billion, two hundred four million, six hundred eight thousand, two hundred thirteen".