66637443744756 has 60 divisors (see below), whose sum is σ = 174208295863140. Its totient is φ = 22211862197760.

The previous prime is 66637443744749. The next prime is 66637443744787. The reversal of 66637443744756 is 65744734473666.

It can be written as a sum of positive squares in 2 ways, for example, as 46782398934756 + 19855044810000 = 6839766^2 + 4455900^2 .

It is a congruent number.

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, 8851396 + ... + 14547236.

It is an arithmetic number, because the mean of its divisors is an integer number (2903471597719).

Almost surely, 2^{66637443744756} is an apocalyptic number.

It is an amenable number.

66637443744756 is an abundant number, since it is smaller than the sum of its proper divisors (107570852118384).

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

66637443744756 is a wasteful number, since it uses less digits than its factorization.

66637443744756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731966 (or 5731955 counting only the distinct ones).

The product of its digits is 5120962560, while the sum is 72.

The spelling of 66637443744756 in words is "sixty-six trillion, six hundred thirty-seven billion, four hundred forty-three million, seven hundred forty-four thousand, seven hundred fifty-six".