66735596736 has 140 divisors (see below), whose sum is σ = 201069204160. Its totient is φ = 21880419840.

The previous prime is 66735596689. The next prime is 66735596743. The reversal of 66735596736 is 63769553766.

It is a happy number.

66735596736 is a `hidden beast` number, since 6 + 6 + 7 + 3 + 5 + 596 + 7 + 36 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 210705 + ... + 421743.

Almost surely, 2^66735596736 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 66735596736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100534602080).

66735596736 is an abundant number, since it is smaller than the sum of its proper divisors (134333607424).

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

66735596736 is a wasteful number, since it uses less digits than its factorization.

66735596736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211124 (or 211105 counting only the distinct ones).

The product of its digits is 128595600, while the sum is 63.

The spelling of 66735596736 in words is "sixty-six billion, seven hundred thirty-five million, five hundred ninety-six thousand, seven hundred thirty-six".