666495648 has 384 divisors, whose sum is σ = 2455488000. Its totient is φ = 174763008.

The previous prime is 666495647. The next prime is 666495653. The reversal of 666495648 is 846594666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 666495594 and 666495603.

It is not an unprimeable number, because it can be changed into a prime (666495647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3852490 + ... + 3852662.

It is an arithmetic number, because the mean of its divisors is an integer number (6394500).

Almost surely, 2^666495648 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 666495648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227744000).

666495648 is an abundant number, since it is smaller than the sum of its proper divisors (1788992352).

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

666495648 is a wasteful number, since it uses less digits than its factorization.

666495648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 198 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 666495648 is about 25816.5770000595. The cubic root of 666495648 is about 873.5057590647.

The spelling of 666495648 in words is "six hundred sixty-six million, four hundred ninety-five thousand, six hundred forty-eight".