666354376 has 8 divisors (see below), whose sum is σ = 1249414470. Its totient is φ = 333177184.

The previous prime is 666354343. The next prime is 666354379. The reversal of 666354376 is 673453666.

It can be written as a sum of positive squares in only one way, i.e., 639584100 + 26770276 = 25290^2 + 5174^2 .

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

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (666354379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41647141 + ... + 41647156.

Almost surely, 2^666354376 is an apocalyptic number.

It is an amenable number.

666354376 is a deficient number, since it is larger than the sum of its proper divisors (583060094).

666354376 is a wasteful number, since it uses less digits than its factorization.

666354376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83294303 (or 83294299 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 46.

The square root of 666354376 is about 25813.8407835796. The cubic root of 666354376 is about 873.4440379188. Note that the first 3 decimals are identical.

The spelling of 666354376 in words is "six hundred sixty-six million, three hundred fifty-four thousand, three hundred seventy-six".