161606111556534 has 16 divisors (see below), whose sum is σ = 323212364097840. Its totient is φ = 53868680354720.

The previous prime is 161606111556511. The next prime is 161606111556587. The reversal of 161606111556534 is 435655111606161.

It is a super-2 number, since 2×161606111556534² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14420644 + ... + 23047064.

It is an arithmetic number, because the mean of its divisors is an integer number (20200772756115).

Almost surely, 2^{161606111556534} is an apocalyptic number.

161606111556534 is an abundant number, since it is smaller than the sum of its proper divisors (161606252541306).

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

161606111556534 is a wasteful number, since it uses less digits than its factorization.

161606111556534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11748735.

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 161606111556534 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred eleven million, five hundred fifty-six thousand, five hundred thirty-four".