66543335766 has 24 divisors (see below), whose sum is σ = 144200982744. Its totient is φ = 22177457280.

The previous prime is 66543335737. The next prime is 66543335767. The reversal of 66543335766 is 66753334566.

66543335766 is a `hidden beast` number, since 6 + 6 + 543 + 3 + 35 + 7 + 66 = 666.

It is a super-2 number, since 2×66543335766² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66543335767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191131 + ... + 411846.

It is an arithmetic number, because the mean of its divisors is an integer number (6008374281).

Almost surely, 2^66543335766 is an apocalyptic number.

66543335766 is an abundant number, since it is smaller than the sum of its proper divisors (77657646978).

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

66543335766 is a wasteful number, since it uses less digits than its factorization.

66543335766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609116 (or 609113 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 54.

The spelling of 66543335766 in words is "sixty-six billion, five hundred forty-three million, three hundred thirty-five thousand, seven hundred sixty-six".