161606111556562 has 16 divisors (see below), whose sum is σ = 242824019360472. Its totient is φ = 80664876892800.

The previous prime is 161606111556511. The next prime is 161606111556587. The reversal of 161606111556562 is 265655111606161.

It can be written as a sum of positive squares in 4 ways, for example, as 139664391284961 + 21941720271601 = 11817969^2 + 4684199^2 .

It is a super-2 number, since 2×161606111556562² (a number of 29 digits) contains 22 as substring.

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, 23204689 + ... + 29354212.

Almost surely, 2^{161606111556562} is an apocalyptic number.

161606111556562 is a deficient number, since it is larger than the sum of its proper divisors (81217907803910).

161606111556562 is a wasteful number, since it uses less digits than its factorization.

161606111556562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52561533.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 161606111556562 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred eleven million, five hundred fifty-six thousand, five hundred sixty-two".