161656112712 has 16 divisors (see below), whose sum is σ = 404140281840. Its totient is φ = 53885370896.

The previous prime is 161656112701. The next prime is 161656112753. The reversal of 161656112712 is 217211656161.

It is a super-2 number, since 2×161656112712² (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 3 ways as a sum of consecutive naturals, for example, 3367835658 + ... + 3367835705.

It is an arithmetic number, because the mean of its divisors is an integer number (25258767615).

Almost surely, 2^161656112712 is an apocalyptic number.

161656112712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161656112712 is an abundant number, since it is smaller than the sum of its proper divisors (242484169128).

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

161656112712 is a wasteful number, since it uses less digits than its factorization.

161656112712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735671372 (or 6735671368 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

Adding to 161656112712 its reverse (217211656161), we get a palindrome (378867768873).

The spelling of 161656112712 in words is "one hundred sixty-one billion, six hundred fifty-six million, one hundred twelve thousand, seven hundred twelve".