161616545000 has 160 divisors (see below), whose sum is σ = 383968965600. Its totient is φ = 63747552000.

The previous prime is 161616544951. The next prime is 161616545003. The reversal of 161616545000 is 545616161.

It is a super-2 number, since 2×161616545000² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161616545003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 143914439 + ... + 143915561.

It is an arithmetic number, because the mean of its divisors is an integer number (2399806035).

Almost surely, 2^161616545000 is an apocalyptic number.

161616545000 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 161616545000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191984482800).

161616545000 is an abundant number, since it is smaller than the sum of its proper divisors (222352420600).

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

161616545000 is a wasteful number, since it uses less digits than its factorization.

161616545000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 161616545000 in words is "one hundred sixty-one billion, six hundred sixteen million, five hundred forty-five thousand".