666463847 has 18 divisors (see below), whose sum is σ = 810035208. Its totient is φ = 545707008.

The previous prime is 666463841. The next prime is 666463871. The reversal of 666463847 is 748364666.

It is not a de Polignac number, because 666463847 - 2⁶ = 666463783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666463795 and 666463804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666463841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 866279 + ... + 867047.

It is an arithmetic number, because the mean of its divisors is an integer number (45001956).

Almost surely, 2^666463847 is an apocalyptic number.

666463847 is a deficient number, since it is larger than the sum of its proper divisors (143571361).

666463847 is an frugal number, since it uses more digits than its factorization.

666463847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 799 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 50.

The square root of 666463847 is about 25815.9610899924. The cubic root of 666463847 is about 873.4918661016.

The spelling of 666463847 in words is "six hundred sixty-six million, four hundred sixty-three thousand, eight hundred forty-seven".