161101066566 has 16 divisors (see below), whose sum is σ = 351493236288. Its totient is φ = 48818505000.

The previous prime is 161101066547. The next prime is 161101066571. The reversal of 161101066566 is 665660101161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1220462560 + ... + 1220462691.

It is an arithmetic number, because the mean of its divisors is an integer number (21968327268).

Almost surely, 2^161101066566 is an apocalyptic number.

161101066566 is an abundant number, since it is smaller than the sum of its proper divisors (190392169722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161101066566 is a wasteful number, since it uses less digits than its factorization.

161101066566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440925267.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 161101066566 in words is "one hundred sixty-one billion, one hundred one million, sixty-six thousand, five hundred sixty-six".