161366210 has 16 divisors (see below), whose sum is σ = 307545336. Its totient is φ = 60749568.

The previous prime is 161366203. The next prime is 161366267. The reversal of 161366210 is 12663161.

It is a Cunningham number, because it is equal to 12703²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 125641681 + 35724529 = 11209^2 + 5977^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161366210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474437 + ... + 474776.

Almost surely, 2^161366210 is an apocalyptic number.

161366210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161366210 is a deficient number, since it is larger than the sum of its proper divisors (146179126).

161366210 is a wasteful number, since it uses less digits than its factorization.

161366210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949237.

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

The square root of 161366210 is about 12703.0000393608. Note that the first 4 decimals coincide. The cubic root of 161366210 is about 544.4243395633.

The spelling of 161366210 in words is "one hundred sixty-one million, three hundred sixty-six thousand, two hundred ten".