666841770 has 48 divisors (see below), whose sum is σ = 1981474560. Its totient is φ = 152420832.

The previous prime is 666841759. The next prime is 666841771. The reversal of 666841770 is 77148666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (666841771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 528610 + ... + 529869.

It is an arithmetic number, because the mean of its divisors is an integer number (41280720).

Almost surely, 2^666841770 is an apocalyptic number.

666841770 is an abundant number, since it is smaller than the sum of its proper divisors (1314632790).

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

666841770 is a wasteful number, since it uses less digits than its factorization.

666841770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058499 (or 1058496 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 666841770 is about 25823.2796135580. The cubic root of 666841770 is about 873.6569414667.

The spelling of 666841770 in words is "six hundred sixty-six million, eight hundred forty-one thousand, seven hundred seventy".