66703859712 has 336 divisors, whose sum is σ = 221457268032. Its totient is φ = 18951045120.

The previous prime is 66703859689. The next prime is 66703859743. The reversal of 66703859712 is 21795830766.

66703859712 is a `hidden beast` number, since 6 + 6 + 7 + 0 + 38 + 597 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

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, 158441262 + ... + 158441682.

It is an arithmetic number, because the mean of its divisors is an integer number (659099012).

Almost surely, 2^66703859712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66703859712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110728634016).

66703859712 is an abundant number, since it is smaller than the sum of its proper divisors (154753408320).

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

66703859712 is a wasteful number, since it uses less digits than its factorization.

66703859712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 66703859712 in words is "sixty-six billion, seven hundred three million, eight hundred fifty-nine thousand, seven hundred twelve".