161008072 has 8 divisors (see below), whose sum is σ = 301890150. Its totient is φ = 80504032.

The previous prime is 161008063. The next prime is 161008093. The reversal of 161008072 is 270800161.

It can be written as a sum of positive squares in only one way, i.e., 110796676 + 50211396 = 10526^2 + 7086^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062997 + ... + 10063012.

Almost surely, 2^161008072 is an apocalyptic number.

161008072 is the 6783-rd centered heptagonal number.

It is an amenable number.

161008072 is a deficient number, since it is larger than the sum of its proper divisors (140882078).

161008072 is a wasteful number, since it uses less digits than its factorization.

161008072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20126015 (or 20126011 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 161008072 is about 12688.8956178227. The cubic root of 161008072 is about 544.0212740383.

The spelling of 161008072 in words is "one hundred sixty-one million, eight thousand, seventy-two".