1081566611 has 4 divisors (see below), whose sum is σ = 1083903072. Its totient is φ = 1079230152.

The previous prime is 1081566599. The next prime is 1081566623. The reversal of 1081566611 is 1166651801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1166651801 = 7 ⋅166664543.

It is an interprime number because it is at equal distance from previous prime (1081566599) and next prime (1081566623).

It is a cyclic number.

It is not a de Polignac number, because 1081566611 - 2⁶ = 1081566547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081569611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1167536 + ... + 1168461.

It is an arithmetic number, because the mean of its divisors is an integer number (270975768).

Almost surely, 2^1081566611 is an apocalyptic number.

1081566611 is a deficient number, since it is larger than the sum of its proper divisors (2336461).

1081566611 is an equidigital number, since it uses as much as digits as its factorization.

1081566611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336460.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 1081566611 is about 32887.1800402528. The cubic root of 1081566611 is about 1026.4814148356.

The spelling of 1081566611 in words is "one billion, eighty-one million, five hundred sixty-six thousand, six hundred eleven".