666601452 has 72 divisors (see below), whose sum is σ = 1883084112. Its totient is φ = 197068800.

The previous prime is 666601357. The next prime is 666601459. The reversal of 666601452 is 254106666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (666601459) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4293 + ... + 36764.

It is an arithmetic number, because the mean of its divisors is an integer number (26153946).

Almost surely, 2^666601452 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 666601452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941542056).

666601452 is an abundant number, since it is smaller than the sum of its proper divisors (1216482660).

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

666601452 is a wasteful number, since it uses less digits than its factorization.

666601452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41119 (or 41114 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 666601452 is about 25818.6260672407. The cubic root of 666601452 is about 873.5519786780.

The spelling of 666601452 in words is "six hundred sixty-six million, six hundred one thousand, four hundred fifty-two".