666684463 has 8 divisors (see below), whose sum is σ = 714473568. Its totient is φ = 620462304.

The previous prime is 666684457. The next prime is 666684517. The reversal of 666684463 is 364486666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666684463 - 2¹³ = 666676271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666684443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390856 + ... + 392557.

It is an arithmetic number, because the mean of its divisors is an integer number (89309196).

Almost surely, 2^666684463 is an apocalyptic number.

666684463 is a deficient number, since it is larger than the sum of its proper divisors (47789105).

666684463 is a wasteful number, since it uses less digits than its factorization.

666684463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783473.

The product of its digits is 2985984, while the sum is 49.

The square root of 666684463 is about 25820.2335969294. The cubic root of 666684463 is about 873.5882379317.

The spelling of 666684463 in words is "six hundred sixty-six million, six hundred eighty-four thousand, four hundred sixty-three".