166606001556 has 24 divisors (see below), whose sum is σ = 409207723680. Its totient is φ = 52612421472.

The previous prime is 166606001501. The next prime is 166606001579. The reversal of 166606001556 is 655100606661.

It is a super-2 number, since 2×166606001556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 365363811 + ... + 365364266.

It is an arithmetic number, because the mean of its divisors is an integer number (17050321820).

Almost surely, 2^166606001556 is an apocalyptic number.

It is an amenable number.

166606001556 is an abundant number, since it is smaller than the sum of its proper divisors (242601722124).

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

166606001556 is a wasteful number, since it uses less digits than its factorization.

166606001556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730728103 (or 730728101 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 166606001556 in words is "one hundred sixty-six billion, six hundred six million, one thousand, five hundred fifty-six".