161206210701 has 24 divisors (see below), whose sum is σ = 237416245560. Its totient is φ = 105367781376.

The previous prime is 161206210687. The next prime is 161206210703. The reversal of 161206210701 is 107012602161.

It is a happy number.

161206210701 is a `hidden beast` number, since 16 + 1 + 20 + 621 + 0 + 7 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 486202500 + 160720008201 = 22050^2 + 400899^2 .

It is not a de Polignac number, because 161206210701 - 2⁹ = 161206210189 is a prime.

It is a super-2 number, since 2×161206210701² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161206210703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 552165 + ... + 792021.

It is an arithmetic number, because the mean of its divisors is an integer number (9892343565).

Almost surely, 2^161206210701 is an apocalyptic number.

It is an amenable number.

161206210701 is a deficient number, since it is larger than the sum of its proper divisors (76210034859).

161206210701 is a wasteful number, since it uses less digits than its factorization.

161206210701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241325 (or 241322 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

Adding to 161206210701 its reverse (107012602161), we get a palindrome (268218812862).

The spelling of 161206210701 in words is "one hundred sixty-one billion, two hundred six million, two hundred ten thousand, seven hundred one".