166881625 has 8 divisors (see below), whose sum is σ = 208268424. Its totient is φ = 133505200.

The previous prime is 166881619. The next prime is 166881643. The reversal of 166881625 is 526188661.

It can be written as a sum of positive squares in 4 ways, for example, as 29030544 + 137851081 = 5388^2 + 11741^2 .

It is not a de Polignac number, because 166881625 - 2¹¹ = 166879577 is a prime.

It is a Duffinian 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, 667402 + ... + 667651.

It is an arithmetic number, because the mean of its divisors is an integer number (26033553).

Almost surely, 2^166881625 is an apocalyptic number.

It is an amenable number.

166881625 is a deficient number, since it is larger than the sum of its proper divisors (41386799).

166881625 is an equidigital number, since it uses as much as digits as its factorization.

166881625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335068 (or 1335058 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 166881625 is about 12918.2671051500. The cubic root of 166881625 is about 550.5576987664.

The spelling of 166881625 in words is "one hundred sixty-six million, eight hundred eighty-one thousand, six hundred twenty-five".