161066515561 has 8 divisors (see below), whose sum is σ = 185248477760. Its totient is φ = 137177668368.

The previous prime is 161066515531. The next prime is 161066515601. The reversal of 161066515561 is 165515660161.

161066515561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161066515561 - 2¹⁵ = 161066482793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161066515501) 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 in 7 ways as a sum of consecutive naturals, for example, 73277571 + ... + 73279768.

It is an arithmetic number, because the mean of its divisors is an integer number (23156059720).

Almost surely, 2^161066515561 is an apocalyptic number.

It is an amenable number.

161066515561 is a deficient number, since it is larger than the sum of its proper divisors (24181962199).

161066515561 is a wasteful number, since it uses less digits than its factorization.

161066515561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146557503.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161066515561 in words is "one hundred sixty-one billion, sixty-six million, five hundred fifteen thousand, five hundred sixty-one".