1256744655453 has 16 divisors (see below), whose sum is σ = 1966797299840. Its totient is φ = 698730618816.

The previous prime is 1256744655449. The next prime is 1256744655473. The reversal of 1256744655453 is 3545564476521.

It is not a de Polignac number, because 1256744655453 - 2² = 1256744655449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256744655393 and 1256744655402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256744655433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 808715218 + ... + 808716771.

It is an arithmetic number, because the mean of its divisors is an integer number (122924831240).

Almost surely, 2^{1256744655453} is an apocalyptic number.

It is an amenable number.

1256744655453 is a deficient number, since it is larger than the sum of its proper divisors (710052644387).

1256744655453 is a wasteful number, since it uses less digits than its factorization.

1256744655453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617432036.

The product of its digits is 60480000, while the sum is 57.

The spelling of 1256744655453 in words is "one trillion, two hundred fifty-six billion, seven hundred forty-four million, six hundred fifty-five thousand, four hundred fifty-three".