1056644562665 has 16 divisors (see below), whose sum is σ = 1273340608128. Its totient is φ = 841744127616.

The previous prime is 1056644562613. The next prime is 1056644562667. The reversal of 1056644562665 is 5662654466501.

It is a cyclic number.

It is not a de Polignac number, because 1056644562665 - 2¹⁴ = 1056644546281 is a prime.

It is a super-2 number, since 2×1056644562665² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1056644562665.

It is not an unprimeable number, because it can be changed into a prime (1056644562667) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 879269 + ... + 1698941.

It is an arithmetic number, because the mean of its divisors is an integer number (79583788008).

Almost surely, 2^{1056644562665} is an apocalyptic number.

It is an amenable number.

1056644562665 is a deficient number, since it is larger than the sum of its proper divisors (216696045463).

1056644562665 is an equidigital number, since it uses as much as digits as its factorization.

1056644562665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820768.

The product of its (nonzero) digits is 31104000, while the sum is 56.

The spelling of 1056644562665 in words is "one trillion, fifty-six billion, six hundred forty-four million, five hundred sixty-two thousand, six hundred sixty-five".