161201646 has 24 divisors (see below), whose sum is σ = 349713000. Its totient is φ = 53665776.

The previous prime is 161201617. The next prime is 161201653. The reversal of 161201646 is 646102161.

161201646 is a `hidden beast` number, since 1 + 6 + 12 + 0 + 1 + 646 = 666.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10105 + ... + 20603.

It is an arithmetic number, because the mean of its divisors is an integer number (14571375).

Almost surely, 2^161201646 is an apocalyptic number.

161201646 is an abundant number, since it is smaller than the sum of its proper divisors (188511354).

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

161201646 is a wasteful number, since it uses less digits than its factorization.

161201646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360 (or 11357 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161201646 is about 12696.5210195549. The cubic root of 161201646 is about 544.2392055539.

It can be divided in two parts, 16120 and 1646, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 161201646 in words is "one hundred sixty-one million, two hundred one thousand, six hundred forty-six".