161679180 has 192 divisors, whose sum is σ = 525813120. Its totient is φ = 36765696.

The previous prime is 161679179. The next prime is 161679181. The reversal of 161679180 is 81976161.

It is an interprime number because it is at equal distance from previous prime (161679179) and next prime (161679181).

It is a super-2 number, since 2×161679180² = 52280314490944800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (161679181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1180072 + ... + 1180208.

It is an arithmetic number, because the mean of its divisors is an integer number (2738610).

Almost surely, 2^161679180 is an apocalyptic number.

161679180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161679180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262906560).

161679180 is an abundant number, since it is smaller than the sum of its proper divisors (364133940).

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

161679180 is a wasteful number, since it uses less digits than its factorization.

161679180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 161679180 is about 12715.3128156566. The cubic root of 161679180 is about 544.7760828596.

The spelling of 161679180 in words is "one hundred sixty-one million, six hundred seventy-nine thousand, one hundred eighty".