1256155062313 has 4 divisors (see below), whose sum is σ = 1256181554628. Its totient is φ = 1256128570000.

The previous prime is 1256155062191. The next prime is 1256155062347. The reversal of 1256155062313 is 3132605516521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 569099745769 + 687055316544 = 754387^2 + 828888^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256155062313 - 2²¹ = 1256152965161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256155062373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13174906 + ... + 13269907.

It is an arithmetic number, because the mean of its divisors is an integer number (314045388657).

Almost surely, 2^{1256155062313} is an apocalyptic number.

It is an amenable number.

1256155062313 is a deficient number, since it is larger than the sum of its proper divisors (26492315).

1256155062313 is an equidigital number, since it uses as much as digits as its factorization.

1256155062313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26492314.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 1256155062313 in words is "one trillion, two hundred fifty-six billion, one hundred fifty-five million, sixty-two thousand, three hundred thirteen".