161305564446 has 96 divisors (see below), whose sum is σ = 382483745280. Its totient is φ = 48829442112.

The previous prime is 161305564417. The next prime is 161305564451. The reversal of 161305564446 is 644465503161.

161305564446 is a `hidden beast` number, since 1 + 6 + 13 + 0 + 556 + 44 + 46 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13147711 + ... + 13159973.

It is an arithmetic number, because the mean of its divisors is an integer number (3984205680).

Almost surely, 2^161305564446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161305564446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191241872640).

161305564446 is an abundant number, since it is smaller than the sum of its proper divisors (221178180834).

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

161305564446 is a wasteful number, since it uses less digits than its factorization.

161305564446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13190 (or 13187 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 161305564446 in words is "one hundred sixty-one billion, three hundred five million, five hundred sixty-four thousand, four hundred forty-six".