66354353712 has 240 divisors, whose sum is σ = 195890240000. Its totient is φ = 21740389632.

The previous prime is 66354353683. The next prime is 66354353783. The reversal of 66354353712 is 21735345366.

It is a happy number.

66354353712 is a `hidden beast` number, since 6 + 63 + 5 + 43 + 537 + 12 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107195739 + ... + 107196357.

Almost surely, 2^66354353712 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 66354353712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97945120000).

66354353712 is an abundant number, since it is smaller than the sum of its proper divisors (129535886288).

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

66354353712 is a wasteful number, since it uses less digits than its factorization.

66354353712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070 (or 1052 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The spelling of 66354353712 in words is "sixty-six billion, three hundred fifty-four million, three hundred fifty-three thousand, seven hundred twelve".