217161640073142 has 48 divisors (see below), whose sum is σ = 470955501553680. Its totient is φ = 72319740134400.

The previous prime is 217161640073141. The next prime is 217161640073153. The reversal of 217161640073142 is 241370046161712.

217161640073142 is a `hidden beast` number, since 2 + 1 + 7 + 161 + 6 + 400 + 73 + 14 + 2 = 666.

217161640073142 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 2×217161640073142² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217161640073141) 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, 458451142 + ... + 458924582.

It is an arithmetic number, because the mean of its divisors is an integer number (9811572949035).

Almost surely, 2^{217161640073142} is an apocalyptic number.

217161640073142 is an abundant number, since it is smaller than the sum of its proper divisors (253793861480538).

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

217161640073142 is a wasteful number, since it uses less digits than its factorization.

217161640073142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497149 (or 497146 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 217161640073142 in words is "two hundred seventeen trillion, one hundred sixty-one billion, six hundred forty million, seventy-three thousand, one hundred forty-two".