666117236 has 12 divisors (see below), whose sum is σ = 1177723428. Its totient is φ = 329624832.

The previous prime is 666117227. The next prime is 666117293. The reversal of 666117236 is 632711666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 446899600 + 219217636 = 21140^2 + 14806^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666117236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858011 + ... + 858786.

It is an arithmetic number, because the mean of its divisors is an integer number (98143619).

Almost surely, 2^666117236 is an apocalyptic number.

It is an amenable number.

666117236 is a deficient number, since it is larger than the sum of its proper divisors (511606192).

666117236 is a wasteful number, since it uses less digits than its factorization.

666117236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716898 (or 1716896 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 666117236 is about 25809.2471025406. The cubic root of 666117236 is about 873.3404128297.

The spelling of 666117236 in words is "six hundred sixty-six million, one hundred seventeen thousand, two hundred thirty-six".