161636563200 has 432 divisors, whose sum is σ = 624529777536. Its totient is φ = 36043161600.

The previous prime is 161636563199. The next prime is 161636563219. The reversal of 161636563200 is 2365636161.

It is a happy number.

It is a super-2 number, since 2×161636563200² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 5495734 + ... + 5525066.

Almost surely, 2^161636563200 is an apocalyptic number.

161636563200 is a gapful number since it is divisible by the number (10) 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 161636563200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312264888768).

161636563200 is an abundant number, since it is smaller than the sum of its proper divisors (462893214336).

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

161636563200 is a wasteful number, since it uses less digits than its factorization.

161636563200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29410 (or 29391 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 161636563200 in words is "one hundred sixty-one billion, six hundred thirty-six million, five hundred sixty-three thousand, two hundred".