161600197065 has 32 divisors (see below), whose sum is σ = 273872793600. Its totient is φ = 81086429184.

The previous prime is 161600196971. The next prime is 161600197067. The reversal of 161600197065 is 560791006161.

It is not a de Polignac number, because 161600197065 - 2¹⁶ = 161600131529 is a prime.

It is a super-2 number, since 2×161600197065² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161600197067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567261 + ... + 803109.

It is an arithmetic number, because the mean of its divisors is an integer number (8558524800).

Almost surely, 2^161600197065 is an apocalyptic number.

161600197065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161600197065 is a deficient number, since it is larger than the sum of its proper divisors (112272596535).

161600197065 is a wasteful number, since it uses less digits than its factorization.

161600197065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238561.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 161600197065 in words is "one hundred sixty-one billion, six hundred million, one hundred ninety-seven thousand, sixty-five".