166031385 has 32 divisors (see below), whose sum is σ = 292752768. Its totient is φ = 79833600.

The previous prime is 166031363. The next prime is 166031389. The reversal of 166031385 is 583130661.

It is not a de Polignac number, because 166031385 - 2²⁰ = 164982809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166031389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1516 + ... + 18285.

It is an arithmetic number, because the mean of its divisors is an integer number (9148524).

Almost surely, 2^166031385 is an apocalyptic number.

166031385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166031385 is a deficient number, since it is larger than the sum of its proper divisors (126721383).

166031385 is a wasteful number, since it uses less digits than its factorization.

166031385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19865.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166031385 is about 12885.3166433736. The cubic root of 166031385 is about 549.6210999137.

The spelling of 166031385 in words is "one hundred sixty-six million, thirty-one thousand, three hundred eighty-five".