666488808464 has 10 divisors (see below), whose sum is σ = 1291322066430. Its totient is φ = 333244404224.

The previous prime is 666488808457. The next prime is 666488808481. The reversal of 666488808464 is 464808884666.

It can be written as a sum of positive squares in only one way, i.e., 541413412864 + 125075395600 = 735808^2 + 353660^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666488808394 and 666488808403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20827775249 + ... + 20827775280.

It is an arithmetic number, because the mean of its divisors is an integer number (129132206643).

Almost surely, 2^666488808464 is an apocalyptic number.

It is an amenable number.

666488808464 is a deficient number, since it is larger than the sum of its proper divisors (624833257966).

666488808464 is a wasteful number, since it uses less digits than its factorization.

666488808464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41655550537 (or 41655550531 counting only the distinct ones).

The product of its (nonzero) digits is 339738624, while the sum is 68.

The spelling of 666488808464 in words is "six hundred sixty-six billion, four hundred eighty-eight million, eight hundred eight thousand, four hundred sixty-four".