161711672 has 8 divisors (see below), whose sum is σ = 303209400. Its totient is φ = 80855832.

The previous prime is 161711663. The next prime is 161711677. The reversal of 161711672 is 276117161.

161711672 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×161711672² = 52301329722071168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161711677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106972 + ... + 10106987.

It is an arithmetic number, because the mean of its divisors is an integer number (37901175).

Almost surely, 2^161711672 is an apocalyptic number.

It is an amenable number.

161711672 is a deficient number, since it is larger than the sum of its proper divisors (141497728).

161711672 is a wasteful number, since it uses less digits than its factorization.

161711672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20213965 (or 20213961 counting only the distinct ones).

The product of its digits is 3528, while the sum is 32.

The square root of 161711672 is about 12716.5904235373. The cubic root of 161711672 is about 544.8125742183.

The spelling of 161711672 in words is "one hundred sixty-one million, seven hundred eleven thousand, six hundred seventy-two".