161081738 has 8 divisors (see below), whose sum is σ = 242087940. Its totient is φ = 80385760.

The previous prime is 161081729. The next prime is 161081771. The reversal of 161081738 is 837180161.

161081738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 160452889 + 628849 = 12667^2 + 793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 161081698 and 161081707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76253 + ... + 78336.

Almost surely, 2^161081738 is an apocalyptic number.

161081738 is a deficient number, since it is larger than the sum of its proper divisors (81006202).

161081738 is a wasteful number, since it uses less digits than its factorization.

161081738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155112.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 161081738 is about 12691.7980601647. The cubic root of 161081738 is about 544.1042300463.

The spelling of 161081738 in words is "one hundred sixty-one million, eighty-one thousand, seven hundred thirty-eight".