161742186756 has 36 divisors (see below), whose sum is σ = 408893455152. Its totient is φ = 53908108464.

The previous prime is 161742186721. The next prime is 161742186773. The reversal of 161742186756 is 657681247161.

161742186756 is a `hidden beast` number, since 1 + 617 + 4 + 2 + 18 + 6 + 7 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161742186756² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88711 + ... + 575633.

It is an arithmetic number, because the mean of its divisors is an integer number (11358151532).

Almost surely, 2^161742186756 is an apocalyptic number.

It is an amenable number.

161742186756 is an abundant number, since it is smaller than the sum of its proper divisors (247151268396).

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

161742186756 is a wasteful number, since it uses less digits than its factorization.

161742186756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496160 (or 496155 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 161742186756 in words is "one hundred sixty-one billion, seven hundred forty-two million, one hundred eighty-six thousand, seven hundred fifty-six".