161650506605601 has 64 divisors (see below), whose sum is σ = 238540885051392. Its totient is φ = 96743105851392.

The previous prime is 161650506605593. The next prime is 161650506605611. The reversal of 161650506605601 is 106506605056161.

It is not a de Polignac number, because 161650506605601 - 2³ = 161650506605593 is a prime.

It is a super-2 number, since 2×161650506605601² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161650506605611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 840988161 + ... + 841180353.

It is an arithmetic number, because the mean of its divisors is an integer number (3727201328928).

Almost surely, 2^{161650506605601} is an apocalyptic number.

It is an amenable number.

161650506605601 is a deficient number, since it is larger than the sum of its proper divisors (76890378445791).

161650506605601 is a wasteful number, since it uses less digits than its factorization.

161650506605601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194422.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 161650506605601 in words is "one hundred sixty-one trillion, six hundred fifty billion, five hundred six million, six hundred five thousand, six hundred one".