161780466 has 48 divisors (see below), whose sum is σ = 348359040. Its totient is φ = 50069760.

The previous prime is 161780461. The next prime is 161780467. The reversal of 161780466 is 664087161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161780461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136396 + ... + 137576.

It is an arithmetic number, because the mean of its divisors is an integer number (7257480).

Almost surely, 2^161780466 is an apocalyptic number.

161780466 is an abundant number, since it is smaller than the sum of its proper divisors (186578574).

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

161780466 is a wasteful number, since it uses less digits than its factorization.

161780466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 161780466 is about 12719.2950276342. The cubic root of 161780466 is about 544.8898197716.

The spelling of 161780466 in words is "one hundred sixty-one million, seven hundred eighty thousand, four hundred sixty-six".