66494074752 has 192 divisors, whose sum is σ = 222805870560. Its totient is φ = 18639728640.

The previous prime is 66494074729. The next prime is 66494074769. The reversal of 66494074752 is 25747049466.

66494074752 is a `hidden beast` number, since 66 + 494 + 0 + 7 + 47 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

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, 349602 + ... + 505182.

Almost surely, 2^66494074752 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 66494074752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111402935280).

66494074752 is an abundant number, since it is smaller than the sum of its proper divisors (156311795808).

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

66494074752 is a wasteful number, since it uses less digits than its factorization.

66494074752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155661 (or 155646 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 66494074752 in words is "sixty-six billion, four hundred ninety-four million, seventy-four thousand, seven hundred fifty-two".