161616562 has 4 divisors (see below), whose sum is σ = 242424846. Its totient is φ = 80808280.

The previous prime is 161616491. The next prime is 161616577. The reversal of 161616562 is 265616161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 265616161 = 163 ⋅1629547.

It can be written as a sum of positive squares in only one way, i.e., 137616361 + 24000201 = 11731^2 + 4899^2 .

It is a super-2 number, since 2×161616562² = 52239826225399688, 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, 40404139 + ... + 40404142.

Almost surely, 2^161616562 is an apocalyptic number.

161616562 is a deficient number, since it is larger than the sum of its proper divisors (80808284).

161616562 is an equidigital number, since it uses as much as digits as its factorization.

161616562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80808283.

The product of its digits is 12960, while the sum is 34.

The square root of 161616562 is about 12712.8502704940. The cubic root of 161616562 is about 544.7057435749.

The spelling of 161616562 in words is "one hundred sixty-one million, six hundred sixteen thousand, five hundred sixty-two".