170742135681 has 40 divisors (see below), whose sum is σ = 274723325184. Its totient is φ = 105055198560.

The previous prime is 170742135671. The next prime is 170742135787. The reversal of 170742135681 is 186531247071.

170742135681 is a `hidden beast` number, since 1 + 7 + 0 + 74 + 2 + 13 + 568 + 1 = 666.

It is not a de Polignac number, because 170742135681 - 2⁶ = 170742135617 is a prime.

It is a super-2 number, since 2×170742135681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (170742135631) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10807470 + ... + 10823256.

Almost surely, 2^170742135681 is an apocalyptic number.

It is an amenable number.

170742135681 is a deficient number, since it is larger than the sum of its proper divisors (103981189503).

170742135681 is a wasteful number, since it uses less digits than its factorization.

170742135681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26083 (or 26074 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 170742135681 in words is "one hundred seventy billion, seven hundred forty-two million, one hundred thirty-five thousand, six hundred eighty-one".