161006205663 has 24 divisors (see below), whose sum is σ = 233492688000. Its totient is φ = 106909773264.

The previous prime is 161006205617. The next prime is 161006205739. The reversal of 161006205663 is 366502600161.

161006205663 is a `hidden beast` number, since 16 + 10 + 0 + 620 + 5 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 161006205663 - 2³⁶ = 92286728927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161006203663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2841988 + ... + 2898086.

It is an arithmetic number, because the mean of its divisors is an integer number (9728862000).

Almost surely, 2^161006205663 is an apocalyptic number.

161006205663 is a deficient number, since it is larger than the sum of its proper divisors (72486482337).

161006205663 is a wasteful number, since it uses less digits than its factorization.

161006205663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57371 (or 57368 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 161006205663 in words is "one hundred sixty-one billion, six million, two hundred five thousand, six hundred sixty-three".