161864646 has 8 divisors (see below), whose sum is σ = 323729304. Its totient is φ = 53954880.

The previous prime is 161864623. The next prime is 161864653. The reversal of 161864646 is 646468161.

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

161864646 is an admirable number.

It is a super-5 number, since 5×161864646⁵ (a number of 42 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161864598 and 161864607.

It is a congruent number.

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, 13488715 + ... + 13488726.

It is an arithmetic number, because the mean of its divisors is an integer number (40466163).

Almost surely, 2^161864646 is an apocalyptic number.

161864646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161864646 is a wasteful number, since it uses less digits than its factorization.

161864646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26977446.

The product of its digits is 165888, while the sum is 42.

The square root of 161864646 is about 12722.6037429451. The cubic root of 161864646 is about 544.9843117556.

The spelling of 161864646 in words is "one hundred sixty-one million, eight hundred sixty-four thousand, six hundred forty-six".