666906248 has 8 divisors (see below), whose sum is σ = 1250449230. Its totient is φ = 333453120.

The previous prime is 666906217. The next prime is 666906257. The reversal of 666906248 is 842609666.

It can be written as a sum of positive squares in only one way, i.e., 477072964 + 189833284 = 21842^2 + 13778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41681633 + ... + 41681648.

Almost surely, 2^666906248 is an apocalyptic number.

It is an amenable number.

666906248 is a deficient number, since it is larger than the sum of its proper divisors (583542982).

666906248 is a wasteful number, since it uses less digits than its factorization.

666906248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83363287 (or 83363283 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 666906248 is about 25824.5280305372. The cubic root of 666906248 is about 873.6850989894.

The spelling of 666906248 in words is "six hundred sixty-six million, nine hundred six thousand, two hundred forty-eight".