161601100661718 has 32 divisors (see below), whose sum is σ = 359125753327200. Its totient is φ = 53865204108768.

The previous prime is 161601100661639. The next prime is 161601100661779. The reversal of 161601100661718 is 817166001106161.

It is a happy number.

161601100661718 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 0 + 1 + 10 + 0 + 6 + 617 + 18 = 666.

161601100661718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161601100661718² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49212733 + ... + 52393656.

It is an arithmetic number, because the mean of its divisors is an integer number (11222679791475).

Almost surely, 2^{161601100661718} is an apocalyptic number.

161601100661718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161601100661718 is an abundant number, since it is smaller than the sum of its proper divisors (197524652665482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161601100661718 is a wasteful number, since it uses less digits than its factorization.

161601100661718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101635853 (or 101635847 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

Adding to 161601100661718 its reverse (817166001106161), we get a palindrome (978767101767879).

The spelling of 161601100661718 in words is "one hundred sixty-one trillion, six hundred one billion, one hundred million, six hundred sixty-one thousand, seven hundred eighteen".