668680748136 has 96 divisors (see below), whose sum is σ = 1819576362240. Its totient is φ = 221839951104.

The previous prime is 668680748129. The next prime is 668680748159. The reversal of 668680748136 is 631847086866.

668680748136 is a `hidden beast` number, since 6 + 68 + 68 + 0 + 7 + 481 + 36 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80686185 + ... + 80694471.

It is an arithmetic number, because the mean of its divisors is an integer number (18953920440).

Almost surely, 2^668680748136 is an apocalyptic number.

It is an amenable number.

668680748136 is an abundant number, since it is smaller than the sum of its proper divisors (1150895614104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668680748136 is a wasteful number, since it uses less digits than its factorization.

668680748136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13463 (or 13456 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 668680748136 in words is "six hundred sixty-eight billion, six hundred eighty million, seven hundred forty-eight thousand, one hundred thirty-six".