1056665217005 has 4 divisors (see below), whose sum is σ = 1267998260412. Its totient is φ = 845332173600.

The previous prime is 1056665216989. The next prime is 1056665217053. The reversal of 1056665217005 is 5007125666501.

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 629501014921 + 427164202084 = 793411^2 + 653578^2 .

It is not a de Polignac number, because 1056665217005 - 2⁴ = 1056665216989 is a prime.

It is a super-2 number, since 2×1056665217005² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105666521696 + ... + 105666521705.

It is an arithmetic number, because the mean of its divisors is an integer number (316999565103).

Almost surely, 2^{1056665217005} is an apocalyptic number.

It is an amenable number.

1056665217005 is a deficient number, since it is larger than the sum of its proper divisors (211333043407).

1056665217005 is an equidigital number, since it uses as much as digits as its factorization.

1056665217005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211333043406.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 1056665217005 in words is "one trillion, fifty-six billion, six hundred sixty-five million, two hundred seventeen thousand, five".