161663422016 has 56 divisors (see below), whose sum is σ = 325614411000. Its totient is φ = 79625621504.

The previous prime is 161663421979. The next prime is 161663422027. The reversal of 161663422016 is 610224366161.

It can be written as a sum of positive squares in 4 ways, for example, as 457960000 + 161205462016 = 21400^2 + 401504^2 .

It is a super-2 number, since 2×161663422016² (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 7 ways as a sum of consecutive naturals, for example, 1479470 + ... + 1584978.

Almost surely, 2^161663422016 is an apocalyptic number.

161663422016 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 161663422016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162807205500).

161663422016 is an abundant number, since it is smaller than the sum of its proper divisors (163950988984).

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

161663422016 is a wasteful number, since it uses less digits than its factorization.

161663422016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105879 (or 105869 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 161663422016 its reverse (610224366161), we get a palindrome (771887788177).

The spelling of 161663422016 in words is "one hundred sixty-one billion, six hundred sixty-three million, four hundred twenty-two thousand, sixteen".