163120661 has 16 divisors (see below), whose sum is σ = 188863488. Its totient is φ = 139238400.

The previous prime is 163120651. The next prime is 163120693. The reversal of 163120661 is 166021361.

It is a cyclic number.

It is not a de Polignac number, because 163120661 - 2¹⁸ = 162858517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163120661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163120651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110156 + ... + 111626.

It is an arithmetic number, because the mean of its divisors is an integer number (11803968).

Almost surely, 2^163120661 is an apocalyptic number.

163120661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163120661 is a deficient number, since it is larger than the sum of its proper divisors (25742827).

163120661 is a wasteful number, since it uses less digits than its factorization.

163120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 163120661 is about 12771.8699100797. The cubic root of 163120661 is about 546.3903127206.

The spelling of 163120661 in words is "one hundred sixty-three million, one hundred twenty thousand, six hundred sixty-one".