161205570 has 24 divisors (see below), whose sum is σ = 419134716. Its totient is φ = 42988128.

The previous prime is 161205547. The next prime is 161205599. The reversal of 161205570 is 75502161.

161205570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148864401 + 12341169 = 12201^2 + 3513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 895497 + ... + 895676.

Almost surely, 2^161205570 is an apocalyptic number.

161205570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161205570 is an abundant number, since it is smaller than the sum of its proper divisors (257929146).

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

161205570 is a wasteful number, since it uses less digits than its factorization.

161205570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791186 (or 1791183 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 161205570 is about 12696.6755491349. The cubic root of 161205570 is about 544.2436215082.

The spelling of 161205570 in words is "one hundred sixty-one million, two hundred five thousand, five hundred seventy".