166961784 has 128 divisors (see below), whose sum is σ = 491028480. Its totient is φ = 46780800.

The previous prime is 166961779. The next prime is 166961803. The reversal of 166961784 is 487169661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187789 + ... + 188675.

It is an arithmetic number, because the mean of its divisors is an integer number (3836160).

Almost surely, 2^166961784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166961784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245514240).

166961784 is an abundant number, since it is smaller than the sum of its proper divisors (324066696).

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

166961784 is a wasteful number, since it uses less digits than its factorization.

166961784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 957 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 166961784 is about 12921.3692772864. The cubic root of 166961784 is about 550.6458352731.

The spelling of 166961784 in words is "one hundred sixty-six million, nine hundred sixty-one thousand, seven hundred eighty-four".