1066005551656 has 8 divisors (see below), whose sum is σ = 1998760409370. Its totient is φ = 533002775824.

The previous prime is 1066005551651. The next prime is 1066005551693. The reversal of 1066005551656 is 6561555006601.

It can be written as a sum of positive squares in only one way, i.e., 540569034756 + 525436516900 = 735234^2 + 724870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1066005551656² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066005551651) 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, 66625346971 + ... + 66625346986.

Almost surely, 2^{1066005551656} is an apocalyptic number.

It is an amenable number.

1066005551656 is a deficient number, since it is larger than the sum of its proper divisors (932754857714).

1066005551656 is a wasteful number, since it uses less digits than its factorization.

1066005551656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133250693963 (or 133250693959 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 1066005551656 in words is "one trillion, sixty-six billion, five million, five hundred fifty-one thousand, six hundred fifty-six".