1066565215161 has 6 divisors (see below), whose sum is σ = 1540594199690. Its totient is φ = 711043476768.

The previous prime is 1066565215153. The next prime is 1066565215181. The reversal of 1066565215161 is 1615125656601.

1066565215161 is a `hidden beast` number, since 1 + 0 + 6 + 6 + 565 + 21 + 5 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 874563502761 + 192001712400 = 935181^2 + 438180^2 .

It is not a de Polignac number, because 1066565215161 - 2³ = 1066565215153 is a prime.

It is a super-2 number, since 2×1066565215161² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066565215141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59253623056 + ... + 59253623073.

Almost surely, 2^{1066565215161} is an apocalyptic number.

It is an amenable number.

1066565215161 is a deficient number, since it is larger than the sum of its proper divisors (474028984529).

1066565215161 is a wasteful number, since it uses less digits than its factorization.

1066565215161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118507246135 (or 118507246132 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 1066565215161 in words is "one trillion, sixty-six billion, five hundred sixty-five million, two hundred fifteen thousand, one hundred sixty-one".