1066011556665 has 24 divisors (see below), whose sum is σ = 1874770740864. Its totient is φ = 516854087200.

The previous prime is 1066011556609. The next prime is 1066011556679. The reversal of 1066011556665 is 5666551106601.

It is not a de Polignac number, because 1066011556665 - 2⁹ = 1066011556153 is a prime.

It is a super-2 number, since 2×1066011556665² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293665281 + ... + 293668910.

It is an arithmetic number, because the mean of its divisors is an integer number (78115447536).

Almost surely, 2^{1066011556665} is an apocalyptic number.

1066011556665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1066011556665 is a deficient number, since it is larger than the sum of its proper divisors (808759184199).

1066011556665 is a wasteful number, since it uses less digits than its factorization.

1066011556665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587334221 (or 587334210 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1066011556665 in words is "one trillion, sixty-six billion, eleven million, five hundred fifty-six thousand, six hundred sixty-five".