161606115065009 has 4 divisors (see below), whose sum is σ = 162768748986480. Its totient is φ = 160443481143540.

The previous prime is 161606115064969. The next prime is 161606115065011. The reversal of 161606115065009 is 900560511606161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161606115065009 - 2²⁸ = 161605846629553 is a prime.

It is a super-2 number, since 2×161606115065009² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161606115065809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581316960527 + ... + 581316960804.

It is an arithmetic number, because the mean of its divisors is an integer number (40692187246620).

Almost surely, 2^{161606115065009} is an apocalyptic number.

It is an amenable number.

161606115065009 is a deficient number, since it is larger than the sum of its proper divisors (1162633921471).

161606115065009 is a wasteful number, since it uses less digits than its factorization.

161606115065009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162633921470.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 161606115065009 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred fifteen million, sixty-five thousand, nine".