81166106061 has 12 divisors (see below), whose sum is σ = 123410453920. Its totient is φ = 51262803720.

The previous prime is 81166106053. The next prime is 81166106089. The reversal of 81166106061 is 16060166118.

It is not a de Polignac number, because 81166106061 - 2³ = 81166106053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81166106261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237327625 + ... + 237327966.

Almost surely, 2^81166106061 is an apocalyptic number.

It is an amenable number.

81166106061 is a deficient number, since it is larger than the sum of its proper divisors (42244347859).

81166106061 is a wasteful number, since it uses less digits than its factorization.

81166106061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474655616 (or 474655613 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 81166106061 in words is "eighty-one billion, one hundred sixty-six million, one hundred six thousand, sixty-one".