66631729536 has 48 divisors (see below), whose sum is σ = 191739745860. Its totient is φ = 22210576128.

The previous prime is 66631729523. The next prime is 66631729543. The reversal of 66631729536 is 63592713666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28918870 + ... + 28921173.

Almost surely, 2^66631729536 is an apocalyptic number.

It is an amenable number.

66631729536 is an abundant number, since it is smaller than the sum of its proper divisors (125108016324).

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

66631729536 is a wasteful number, since it uses less digits than its factorization.

66631729536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57840063 (or 57840048 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 54.

The spelling of 66631729536 in words is "sixty-six billion, six hundred thirty-one million, seven hundred twenty-nine thousand, five hundred thirty-six".