161168643 has 16 divisors (see below), whose sum is σ = 241004160. Its totient is φ = 106439688.

The previous prime is 161168639. The next prime is 161168647. The reversal of 161168643 is 346861161.

161168643 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 6 + 8 + 643 = 666.

161168643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161168639) and next prime (161168647).

It is not a de Polignac number, because 161168643 - 2² = 161168639 is a prime.

It is a super-2 number, since 2×161168643² = 51950662972922898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161168598 and 161168607.

It is not an unprimeable number, because it can be changed into a prime (161168647) 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, 25005 + ... + 30782.

It is an arithmetic number, because the mean of its divisors is an integer number (15062760).

Almost surely, 2^161168643 is an apocalyptic number.

161168643 is a deficient number, since it is larger than the sum of its proper divisors (79835517).

161168643 is a wasteful number, since it uses less digits than its factorization.

161168643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55903 (or 55897 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 161168643 is about 12695.2212662876. The cubic root of 161168643 is about 544.2020621110.

The spelling of 161168643 in words is "one hundred sixty-one million, one hundred sixty-eight thousand, six hundred forty-three".