66340709568 has 126 divisors (see below), whose sum is σ = 221199256356. Its totient is φ = 18954480384.

The previous prime is 66340709549. The next prime is 66340709581. The reversal of 66340709568 is 86590704366.

66340709568 is a `hidden beast` number, since 6 + 6 + 3 + 4 + 0 + 70 + 9 + 568 = 666.

66340709568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (126).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1147030 + ... + 1203477.

Almost surely, 2^66340709568 is an apocalyptic number.

It is an amenable number.

66340709568 is an abundant number, since it is smaller than the sum of its proper divisors (154858546788).

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

66340709568 is a wasteful number, since it uses less digits than its factorization.

66340709568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350539 (or 2350519 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 66340709568 in words is "sixty-six billion, three hundred forty million, seven hundred nine thousand, five hundred sixty-eight".