666840036 has 48 divisors (see below), whose sum is σ = 1694347200. Its totient is φ = 203317632.

The previous prime is 666840029. The next prime is 666840067. The reversal of 666840036 is 630048666.

It is a super-2 number, since 2×666840036² = 889351267224962592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666839976 and 666840003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43815 + ... + 57038.

It is an arithmetic number, because the mean of its divisors is an integer number (35298900).

Almost surely, 2^666840036 is an apocalyptic number.

It is an amenable number.

666840036 is an abundant number, since it is smaller than the sum of its proper divisors (1027507164).

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

666840036 is a wasteful number, since it uses less digits than its factorization.

666840036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100908 (or 100906 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 666840036 is about 25823.2460391795. The cubic root of 666840036 is about 873.6561842044.

The spelling of 666840036 in words is "six hundred sixty-six million, eight hundred forty thousand, thirty-six".