666386140 has 24 divisors (see below), whose sum is σ = 1599327072. Its totient is φ = 228475200.

The previous prime is 666386131. The next prime is 666386141. The reversal of 666386140 is 41683666.

It is a junction number, because it is equal to n+sod(n) for n = 666386093 and 666386102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666386141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2379811 + ... + 2380090.

It is an arithmetic number, because the mean of its divisors is an integer number (66638628).

Almost surely, 2^666386140 is an apocalyptic number.

It is an amenable number.

666386140 is an abundant number, since it is smaller than the sum of its proper divisors (932940932).

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

666386140 is a wasteful number, since it uses less digits than its factorization.

666386140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4759917 (or 4759915 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 666386140 is about 25814.4560275827. The cubic root of 666386140 is about 873.4579162377.

The spelling of 666386140 in words is "six hundred sixty-six million, three hundred eighty-six thousand, one hundred forty".