66667400806668 has 48 divisors (see below), whose sum is σ = 163792471825920. Its totient is φ = 21046694733504.

The previous prime is 66667400806627. The next prime is 66667400806673. The reversal of 66667400806668 is 86660800476666.

It is a super-2 number, since 2×66667400806668² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42058180 + ... + 43614507.

It is an arithmetic number, because the mean of its divisors is an integer number (3412343163040).

Almost surely, 2^{66667400806668} is an apocalyptic number.

It is an amenable number.

66667400806668 is an abundant number, since it is smaller than the sum of its proper divisors (97125071019252).

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

66667400806668 is a wasteful number, since it uses less digits than its factorization.

66667400806668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85676126 (or 85676124 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 69.

The spelling of 66667400806668 in words is "sixty-six trillion, six hundred sixty-seven billion, four hundred million, eight hundred six thousand, six hundred sixty-eight".