66943548810 has 24 divisors (see below), whose sum is σ = 174053227140. Its totient is φ = 17851612992.

The previous prime is 66943548809. The next prime is 66943548883. The reversal of 66943548810 is 1884534966.

66943548810 is a `hidden beast` number, since 6 + 6 + 94 + 3 + 548 + 8 + 1 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60591299409 + 6352249401 = 246153^2 + 79701^2 .

It is a super-2 number, since 2×66943548810² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371908515 + ... + 371908694.

Almost surely, 2^66943548810 is an apocalyptic number.

66943548810 is an abundant number, since it is smaller than the sum of its proper divisors (107109678330).

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

66943548810 is a wasteful number, since it uses less digits than its factorization.

66943548810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743817222 (or 743817219 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 66943548810 in words is "sixty-six billion, nine hundred forty-three million, five hundred forty-eight thousand, eight hundred ten".