161606109999959 has 4 divisors (see below), whose sum is σ = 162330801076416. Its totient is φ = 160881418923504.

The previous prime is 161606109999931. The next prime is 161606109999973. The reversal of 161606109999959 is 959999901606161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161606109999959 is a prime.

It is a super-2 number, since 2×161606109999959² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606109999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362345537894 + ... + 362345538339.

It is an arithmetic number, because the mean of its divisors is an integer number (40582700269104).

Almost surely, 2^{161606109999959} is an apocalyptic number.

161606109999959 is a deficient number, since it is larger than the sum of its proper divisors (724691076457).

161606109999959 is an equidigital number, since it uses as much as digits as its factorization.

161606109999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724691076456.

The product of its (nonzero) digits is 573956280, while the sum is 80.

The spelling of 161606109999959 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred fifty-nine".