1666867020172 has 12 divisors (see below), whose sum is σ = 2938309383240. Its totient is φ = 827350053536.

The previous prime is 1666867020167. The next prime is 1666867020199. The reversal of 1666867020172 is 2710207686661.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520863522 + ... + 1520864617.

It is an arithmetic number, because the mean of its divisors is an integer number (244859115270).

Almost surely, 2^{1666867020172} is an apocalyptic number.

It is an amenable number.

1666867020172 is a deficient number, since it is larger than the sum of its proper divisors (1271442363068).

1666867020172 is a wasteful number, since it uses less digits than its factorization.

1666867020172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041728280 (or 3041728278 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 1666867020172 in words is "one trillion, six hundred sixty-six billion, eight hundred sixty-seven million, twenty thousand, one hundred seventy-two".