665146188 has 288 divisors, whose sum is σ = 2134809600. Its totient is φ = 178319232.

The previous prime is 665146127. The next prime is 665146211. The reversal of 665146188 is 881641566.

665146188 is a `hidden beast` number, since 66 + 51 + 461 + 88 = 666.

665146188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8419533 + ... + 8419611.

Almost surely, 2^665146188 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 665146188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067404800).

665146188 is an abundant number, since it is smaller than the sum of its proper divisors (1469663412).

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

665146188 is a wasteful number, since it uses less digits than its factorization.

665146188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 171 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 665146188 is about 25790.4282244402. The cubic root of 665146188 is about 872.9158289675.

The spelling of 665146188 in words is "six hundred sixty-five million, one hundred forty-six thousand, one hundred eighty-eight".