1056721662613 has 2 divisors, whose sum is σ = 1056721662614. Its totient is φ = 1056721662612.

The previous prime is 1056721662593. The next prime is 1056721662631. The reversal of 1056721662613 is 3162661276501.

Together with next prime (1056721662631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040763151684 + 15958510929 = 1020178^2 + 126327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056721662613 - 2³⁷ = 919282709141 is a prime.

It is a super-2 number, since 2×1056721662613² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056721662673) 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 as a sum of consecutive naturals, namely, 528360831306 + 528360831307.

It is an arithmetic number, because the mean of its divisors is an integer number (528360831307).

Almost surely, 2^{1056721662613} is an apocalyptic number.

It is an amenable number.

1056721662613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056721662613 is an equidigital number, since it uses as much as digits as its factorization.

1056721662613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 1056721662613 in words is "one trillion, fifty-six billion, seven hundred twenty-one million, six hundred sixty-two thousand, six hundred thirteen".