161643116 has 6 divisors (see below), whose sum is σ = 282875460. Its totient is φ = 80821556.

The previous prime is 161643059. The next prime is 161643133. The reversal of 161643116 is 611346161.

161643116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161643116² = 52256993900378912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20205386 + ... + 20205393.

It is an arithmetic number, because the mean of its divisors is an integer number (47145910).

Almost surely, 2^161643116 is an apocalyptic number.

It is an amenable number.

161643116 is a deficient number, since it is larger than the sum of its proper divisors (121232344).

161643116 is a wasteful number, since it uses less digits than its factorization.

161643116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40410783 (or 40410781 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 161643116 is about 12713.8946039363. The cubic root of 161643116 is about 544.7355741072.

Adding to 161643116 its reverse (611346161), we get a palindrome (772989277).

The spelling of 161643116 in words is "one hundred sixty-one million, six hundred forty-three thousand, one hundred sixteen".