161616651201 has 6 divisors (see below), whose sum is σ = 233446273970. Its totient is φ = 107744434128.

The previous prime is 161616651173. The next prime is 161616651221. The reversal of 161616651201 is 102156616161.

161616651201 is a `hidden beast` number, since 1 + 616 + 16 + 6 + 5 + 1 + 20 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 113839434801 + 47777216400 = 337401^2 + 218580^2 .

It is not a de Polignac number, because 161616651201 - 2¹¹ = 161616649153 is a prime.

It is a super-2 number, since 2×161616651201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161616651221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8978702836 + ... + 8978702853.

Almost surely, 2^161616651201 is an apocalyptic number.

It is an amenable number.

161616651201 is a deficient number, since it is larger than the sum of its proper divisors (71829622769).

161616651201 is a wasteful number, since it uses less digits than its factorization.

161616651201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17957405695 (or 17957405692 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 161616651201 in words is "one hundred sixty-one billion, six hundred sixteen million, six hundred fifty-one thousand, two hundred one".