66643377334666 has 16 divisors (see below), whose sum is σ = 109775003249088. Its totient is φ = 30091832028000.

The previous prime is 66643377334649. The next prime is 66643377334669.

66643377334666 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66643377334666³ (a number of 42 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66643377334595 and 66643377334604.

It is not an unprimeable number, because it can be changed into a prime (66643377334669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10030607355 + ... + 10030613998.

It is an arithmetic number, because the mean of its divisors is an integer number (6860937703068).

Almost surely, 2^{66643377334666} is an apocalyptic number.

66643377334666 is a deficient number, since it is larger than the sum of its proper divisors (43131625914422).

66643377334666 is a wasteful number, since it uses less digits than its factorization.

66643377334666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20061221517.

The product of its digits is 2962842624, while the sum is 70.

The spelling of 66643377334666 in words is "sixty-six trillion, six hundred forty-three billion, three hundred seventy-seven million, three hundred thirty-four thousand, six hundred sixty-six".