161616738 has 16 divisors (see below), whose sum is σ = 330111360. Its totient is φ = 52725936.

The previous prime is 161616737. The next prime is 161616743. The reversal of 161616738 is 837616161.

161616738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161616738² = 52239940003521288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161616696 and 161616705.

It is not an unprimeable number, because it can be changed into a prime (161616731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286273 + ... + 286836.

It is an arithmetic number, because the mean of its divisors is an integer number (20631960).

Almost surely, 2^161616738 is an apocalyptic number.

161616738 is an abundant number, since it is smaller than the sum of its proper divisors (168494622).

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

161616738 is a wasteful number, since it uses less digits than its factorization.

161616738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573161.

The product of its digits is 36288, while the sum is 39.

The square root of 161616738 is about 12712.8571926220. The cubic root of 161616738 is about 544.7059413025.

The spelling of 161616738 in words is "one hundred sixty-one million, six hundred sixteen thousand, seven hundred thirty-eight".