161606506600066 has 32 divisors (see below), whose sum is σ = 265389986006208. Its totient is φ = 73195582141440.

The previous prime is 161606506599991. The next prime is 161606506600081. The reversal of 161606506600066 is 660006605606161.

It is a super-2 number, since 2×161606506600066² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161606506599992 and 161606506600019.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201028630 + ... + 201830926.

It is an arithmetic number, because the mean of its divisors is an integer number (8293437062694).

Almost surely, 2^{161606506600066} is an apocalyptic number.

161606506600066 is a deficient number, since it is larger than the sum of its proper divisors (103783479406142).

161606506600066 is a wasteful number, since it uses less digits than its factorization.

161606506600066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834946.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 161606506600066 in words is "one hundred sixty-one trillion, six hundred six billion, five hundred six million, six hundred thousand, sixty-six".