666485952 has 224 divisors, whose sum is σ = 2146279680. Its totient is φ = 179896320.

The previous prime is 666485929. The next prime is 666485959. The reversal of 666485952 is 259584666.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 666485895 and 666485904.

It is not an unprimeable number, because it can be changed into a prime (666485959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 681688 + ... + 682664.

Almost surely, 2^666485952 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 666485952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073139840).

666485952 is an abundant number, since it is smaller than the sum of its proper divisors (1479793728).

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

666485952 is a wasteful number, since it uses less digits than its factorization.

666485952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1029 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 51.

The square root of 666485952 is about 25816.3892130561. The cubic root of 666485952 is about 873.5015232017.

The spelling of 666485952 in words is "six hundred sixty-six million, four hundred eighty-five thousand, nine hundred fifty-two".