161662637056 has 88 divisors (see below), whose sum is σ = 338166758144. Its totient is φ = 77151191040.

The previous prime is 161662637053. The next prime is 161662637063. The reversal of 161662637056 is 650736266161.

It is a super-2 number, since 2×161662637056² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161662637053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282431 + ... + 2352193.

Almost surely, 2^161662637056 is an apocalyptic number.

161662637056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161662637056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169083379072).

161662637056 is an abundant number, since it is smaller than the sum of its proper divisors (176504121088).

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

161662637056 is an equidigital number, since it uses as much as digits as its factorization.

161662637056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69887 (or 69869 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 161662637056 in words is "one hundred sixty-one billion, six hundred sixty-two million, six hundred thirty-seven thousand, fifty-six".