166843440477 has 72 divisors (see below), whose sum is σ = 290170383360. Its totient is φ = 92013485760.

The previous prime is 166843440437. The next prime is 166843440557. The reversal of 166843440477 is 774044348661.

166843440477 is a `hidden beast` number, since 1 + 66 + 84 + 34 + 4 + 0 + 477 = 666.

It is not a de Polignac number, because 166843440477 - 2¹⁰ = 166843439453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166843440437) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5082924 + ... + 5115642.

Almost surely, 2^166843440477 is an apocalyptic number.

It is an amenable number.

166843440477 is a deficient number, since it is larger than the sum of its proper divisors (123326942883).

166843440477 is a wasteful number, since it uses less digits than its factorization.

166843440477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33143 (or 33133 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 54.

The spelling of 166843440477 in words is "one hundred sixty-six billion, eight hundred forty-three million, four hundred forty thousand, four hundred seventy-seven".