166321026 has 20 divisors (see below), whose sum is σ = 372682662. Its totient is φ = 55440288.

The previous prime is 166321019. The next prime is 166321069. The reversal of 166321026 is 620123661.

166321026 is a `hidden beast` number, since 1 + 6 + 632 + 1 + 0 + 26 = 666.

It can be written as a sum of positive squares in only one way, i.e., 99980001 + 66341025 = 9999^2 + 8145^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 513175 + ... + 513498.

Almost surely, 2^166321026 is an apocalyptic number.

166321026 is an abundant number, since it is smaller than the sum of its proper divisors (206361636).

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

166321026 is a wasteful number, since it uses less digits than its factorization.

166321026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026687 (or 1026678 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 166321026 is about 12896.5509342615. The cubic root of 166321026 is about 549.9405180852.

Adding to 166321026 its reverse (620123661), we get a palindrome (786444687).

The spelling of 166321026 in words is "one hundred sixty-six million, three hundred twenty-one thousand, twenty-six".