666040236 has 12 divisors (see below), whose sum is σ = 1554093912. Its totient is φ = 222013408.

The previous prime is 666040213. The next prime is 666040237. The reversal of 666040236 is 632040666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 666040197 and 666040206.

It is not an unprimeable number, because it can be changed into a prime (666040237) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27751665 + ... + 27751688.

It is an arithmetic number, because the mean of its divisors is an integer number (129507826).

Almost surely, 2^666040236 is an apocalyptic number.

It is an amenable number.

666040236 is an abundant number, since it is smaller than the sum of its proper divisors (888053676).

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

666040236 is a wasteful number, since it uses less digits than its factorization.

666040236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55503360 (or 55503358 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 666040236 is about 25807.7553460195. The cubic root of 666040236 is about 873.3067601935.

The spelling of 666040236 in words is "six hundred sixty-six million, forty thousand, two hundred thirty-six".