165666636213124 has 12 divisors (see below), whose sum is σ = 305175382498000. Its totient is φ = 78473669785128.

The previous prime is 165666636213121. The next prime is 165666636213163. The reversal of 165666636213124 is 421312636666561.

It is not an unprimeable number, because it can be changed into a prime (165666636213121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089912080274 + ... + 1089912080425.

Almost surely, 2^{165666636213124} is an apocalyptic number.

It is an amenable number.

165666636213124 is a deficient number, since it is larger than the sum of its proper divisors (139508746284876).

165666636213124 is a wasteful number, since it uses less digits than its factorization.

165666636213124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179824160722 (or 2179824160720 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 58.

The spelling of 165666636213124 in words is "one hundred sixty-five trillion, six hundred sixty-six billion, six hundred thirty-six million, two hundred thirteen thousand, one hundred twenty-four".