1666666684176 has 40 divisors (see below), whose sum is σ = 4636752187200. Its totient is φ = 512820518016.

The previous prime is 1666666684139. The next prime is 1666666684273. The reversal of 1666666684176 is 6714866666661.

It is a super-2 number, since 2×1666666684176² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1666666684176.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1335469476 + ... + 1335470723.

It is an arithmetic number, because the mean of its divisors is an integer number (115918804680).

Almost surely, 2^{1666666684176} is an apocalyptic number.

1666666684176 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666666684176 is an abundant number, since it is smaller than the sum of its proper divisors (2970085503024).

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

1666666684176 is a wasteful number, since it uses less digits than its factorization.

1666666684176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670940223 (or 2670940217 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 69.

The spelling of 1666666684176 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, one hundred seventy-six".