161610005005666 has 16 divisors (see below), whose sum is σ = 277464854082240. Its totient is φ = 69156647912880.

The previous prime is 161610005005639. The next prime is 161610005005667. The reversal of 161610005005666 is 666500500016161.

161610005005666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161610005005666² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161610005005667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8731890736 + ... + 8731909243.

It is an arithmetic number, because the mean of its divisors is an integer number (17341553380140).

Almost surely, 2^{161610005005666} is an apocalyptic number.

161610005005666 is a deficient number, since it is larger than the sum of its proper divisors (115854849076574).

161610005005666 is a wasteful number, since it uses less digits than its factorization.

161610005005666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17463800649.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 161610005005666 in words is "one hundred sixty-one trillion, six hundred ten billion, five million, five thousand, six hundred sixty-six".