66682666628666 has 48 divisors (see below), whose sum is σ = 110938066496064. Its totient is φ = 29811442800000.

The previous prime is 66682666628651. The next prime is 66682666628731.

It is a happy number.

66682666628666 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×66682666628666⁴ (a number of 56 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32903846 + ... + 34871598.

It is an arithmetic number, because the mean of its divisors is an integer number (2311209718668).

Almost surely, 2^{66682666628666} is an apocalyptic number.

66682666628666 is a deficient number, since it is larger than the sum of its proper divisors (44255399867398).

66682666628666 is a wasteful number, since it uses less digits than its factorization.

66682666628666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968119 (or 1968018 counting only the distinct ones).

The product of its digits is 15479341056, while the sum is 80.

The spelling of 66682666628666 in words is "sixty-six trillion, six hundred eighty-two billion, six hundred sixty-six million, six hundred twenty-eight thousand, six hundred sixty-six".