1666872185522 has 16 divisors (see below), whose sum is σ = 2533364044800. Its totient is φ = 822429223200.

The previous prime is 1666872185507. The next prime is 1666872185569. The reversal of 1666872185522 is 2255812786661.

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, 2644322 + ... + 3213437.

It is an arithmetic number, because the mean of its divisors is an integer number (158335252800).

Almost surely, 2^{1666872185522} is an apocalyptic number.

1666872185522 is a deficient number, since it is larger than the sum of its proper divisors (866491859278).

1666872185522 is a wasteful number, since it uses less digits than its factorization.

1666872185522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5859641.

The product of its digits is 19353600, while the sum is 59.

The spelling of 1666872185522 in words is "one trillion, six hundred sixty-six billion, eight hundred seventy-two million, one hundred eighty-five thousand, five hundred twenty-two".