666369847 has 8 divisors (see below), whose sum is σ = 782868240. Its totient is φ = 559191360.

The previous prime is 666369841. The next prime is 666369853. The reversal of 666369847 is 748963666.

It is an interprime number because it is at equal distance from previous prime (666369841) and next prime (666369853).

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

It is not a de Polignac number, because 666369847 - 2¹⁵ = 666337079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666369841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2329822 + ... + 2330107.

It is an arithmetic number, because the mean of its divisors is an integer number (97858530).

Almost surely, 2^666369847 is an apocalyptic number.

666369847 is a deficient number, since it is larger than the sum of its proper divisors (116498393).

666369847 is a wasteful number, since it uses less digits than its factorization.

666369847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659953.

The product of its digits is 7838208, while the sum is 55.

The square root of 666369847 is about 25814.1404466622. The cubic root of 666369847 is about 873.4507975593.

The spelling of 666369847 in words is "six hundred sixty-six million, three hundred sixty-nine thousand, eight hundred forty-seven".