166161320 has 32 divisors (see below), whose sum is σ = 402622920. Its totient is φ = 61351680.

The previous prime is 166161313. The next prime is 166161337. The reversal of 166161320 is 23161661.

It can be written as a sum of positive squares in 4 ways, for example, as 91891396 + 74269924 = 9586^2 + 8618^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 166161320.

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, 159251 + ... + 160290.

Almost surely, 2^166161320 is an apocalyptic number.

166161320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166161320 is an abundant number, since it is smaller than the sum of its proper divisors (236461600).

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

166161320 is a wasteful number, since it uses less digits than its factorization.

166161320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319565 (or 319561 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 166161320 is about 12890.3576366213. The cubic root of 166161320 is about 549.7644390703.

The spelling of 166161320 in words is "one hundred sixty-six million, one hundred sixty-one thousand, three hundred twenty".