666848820 has 96 divisors (see below), whose sum is σ = 2046352896. Its totient is φ = 160912000.

The previous prime is 666848807. The next prime is 666848837. The reversal of 666848820 is 28848666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 666848820.

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, 147595 + ... + 152045.

It is an arithmetic number, because the mean of its divisors is an integer number (21316176).

Almost surely, 2^666848820 is an apocalyptic number.

666848820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666848820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023176448).

666848820 is an abundant number, since it is smaller than the sum of its proper divisors (1379504076).

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

666848820 is a wasteful number, since it uses less digits than its factorization.

666848820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701 (or 4699 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The square root of 666848820 is about 25823.4161179345. The cubic root of 666848820 is about 873.6600202879.

The spelling of 666848820 in words is "six hundred sixty-six million, eight hundred forty-eight thousand, eight hundred twenty".