166345556 has 12 divisors (see below), whose sum is σ = 313497492. Its totient is φ = 76774848.

The previous prime is 166345547. The next prime is 166345573. The reversal of 166345556 is 655543661.

It can be written as a sum of positive squares in 2 ways, for example, as 30250000 + 136095556 = 5500^2 + 11666^2 .

It is a congruent number.

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, 1599425 + ... + 1599528.

It is an arithmetic number, because the mean of its divisors is an integer number (26124791).

Almost surely, 2^166345556 is an apocalyptic number.

It is an amenable number.

166345556 is a deficient number, since it is larger than the sum of its proper divisors (147151936).

166345556 is a wasteful number, since it uses less digits than its factorization.

166345556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198970 (or 3198968 counting only the distinct ones).

The product of its digits is 324000, while the sum is 41.

The square root of 166345556 is about 12897.5019286682. The cubic root of 166345556 is about 549.9675529068.

The spelling of 166345556 in words is "one hundred sixty-six million, three hundred forty-five thousand, five hundred fifty-six".