1055566056565 has 8 divisors (see below), whose sum is σ = 1271388114360. Its totient is φ = 841313614272.

The previous prime is 1055566056553. The next prime is 1055566056607. The reversal of 1055566056565 is 5656506655501.

It can be written as a sum of positive squares in 4 ways, for example, as 10245893284 + 1045320163281 = 101222^2 + 1022409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1055566056565 - 2¹⁹ = 1055565532277 is a prime.

It is a super-2 number, since 2×1055566056565² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392402394 + ... + 392405083.

It is an arithmetic number, because the mean of its divisors is an integer number (158923514295).

Almost surely, 2^{1055566056565} is an apocalyptic number.

It is an amenable number.

1055566056565 is a deficient number, since it is larger than the sum of its proper divisors (215822057795).

1055566056565 is an equidigital number, since it uses as much as digits as its factorization.

1055566056565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784807751.

The product of its (nonzero) digits is 20250000, while the sum is 55.

The spelling of 1055566056565 in words is "one trillion, fifty-five billion, five hundred sixty-six million, fifty-six thousand, five hundred sixty-five".