166986655 has 12 divisors (see below), whose sum is σ = 220257576. Its totient is φ = 121444400.

The previous prime is 166986653. The next prime is 166986667. The reversal of 166986655 is 556689661.

It is not a de Polignac number, because 166986655 - 2¹ = 166986653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166986653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137401 + ... + 138610.

It is an arithmetic number, because the mean of its divisors is an integer number (18354798).

Almost surely, 2^166986655 is an apocalyptic number.

166986655 is a deficient number, since it is larger than the sum of its proper divisors (53270921).

166986655 is a wasteful number, since it uses less digits than its factorization.

166986655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276038 (or 276027 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 52.

The square root of 166986655 is about 12922.3316394527. The cubic root of 166986655 is about 550.6731757265.

The spelling of 166986655 in words is "one hundred sixty-six million, nine hundred eighty-six thousand, six hundred fifty-five".