161646193300 has 72 divisors (see below), whose sum is σ = 352191442680. Its totient is φ = 64397260800.

The previous prime is 161646193279. The next prime is 161646193337. The reversal of 161646193300 is 3391646161.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 87333252484 + 74312940816 = 295522^2 + 272604^2 .

It is a super-2 number, since 2×161646193300² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66220080 + ... + 66222520.

It is an arithmetic number, because the mean of its divisors is an integer number (4891547815).

Almost surely, 2^161646193300 is an apocalyptic number.

161646193300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161646193300 is an abundant number, since it is smaller than the sum of its proper divisors (190545249380).

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

161646193300 is a wasteful number, since it uses less digits than its factorization.

161646193300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861 (or 4854 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 161646193300 in words is "one hundred sixty-one billion, six hundred forty-six million, one hundred ninety-three thousand, three hundred".