161672681 has 8 divisors (see below), whose sum is σ = 169407744. Its totient is φ = 153996480.

The previous prime is 161672677. The next prime is 161672689. The reversal of 161672681 is 186276161.

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

It is a cyclic number.

It is not a de Polignac number, because 161672681 - 2² = 161672677 is a prime.

It is a super-2 number, since 2×161672681² = 52276111563455522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161672689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9041 + ... + 20126.

It is an arithmetic number, because the mean of its divisors is an integer number (21175968).

Almost surely, 2^161672681 is an apocalyptic number.

It is an amenable number.

161672681 is a deficient number, since it is larger than the sum of its proper divisors (7735063).

161672681 is a wasteful number, since it uses less digits than its factorization.

161672681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29431.

The product of its digits is 24192, while the sum is 38.

The square root of 161672681 is about 12715.0572550815. The cubic root of 161672681 is about 544.7687833273.

The spelling of 161672681 in words is "one hundred sixty-one million, six hundred seventy-two thousand, six hundred eighty-one".