161613266 has 4 divisors (see below), whose sum is σ = 242419902. Its totient is φ = 80806632.

The previous prime is 161613251. The next prime is 161613281. The reversal of 161613266 is 662316161.

161613266 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (161613251) and next prime (161613281).

It can be written as a sum of positive squares in only one way, i.e., 161163025 + 450241 = 12695^2 + 671^2 .

It is a super-2 number, since 2×161613266² = 52237695494373512, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 40403315 + ... + 40403318.

Almost surely, 2^161613266 is an apocalyptic number.

161613266 is a deficient number, since it is larger than the sum of its proper divisors (80806636).

161613266 is an equidigital number, since it uses as much as digits as its factorization.

161613266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80806635.

The product of its digits is 7776, while the sum is 32.

The square root of 161613266 is about 12712.7206372200. The cubic root of 161613266 is about 544.7020406492.

The spelling of 161613266 in words is "one hundred sixty-one million, six hundred thirteen thousand, two hundred sixty-six".