666863163424 has 12 divisors (see below), whose sum is σ = 1312886853054. Its totient is φ = 333431581696.

The previous prime is 666863163401. The next prime is 666863163433. The reversal of 666863163424 is 424361368666.

It can be written as a sum of positive squares in only one way, i.e., 393053763600 + 273809399824 = 626940^2 + 523268^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419736897 + ... + 10419736960.

Almost surely, 2^666863163424 is an apocalyptic number.

It is an amenable number.

666863163424 is a deficient number, since it is larger than the sum of its proper divisors (646023689630).

666863163424 is a wasteful number, since it uses less digits than its factorization.

666863163424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20839473867 (or 20839473859 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 55.

The spelling of 666863163424 in words is "six hundred sixty-six billion, eight hundred sixty-three million, one hundred sixty-three thousand, four hundred twenty-four".