161570385 has 24 divisors (see below), whose sum is σ = 281946600. Its totient is φ = 85588992.

The previous prime is 161570371. The next prime is 161570399. The reversal of 161570385 is 583075161.

161570385 is a `hidden beast` number, since 1 + 6 + 1 + 570 + 3 + 85 = 666.

It is an interprime number because it is at equal distance from previous prime (161570371) and next prime (161570399).

It can be written as a sum of positive squares in 4 ways, for example, as 10870209 + 150700176 = 3297^2 + 12276^2 .

It is not a de Polignac number, because 161570385 - 2⁷ = 161570257 is a prime.

It is a super-2 number, since 2×161570385² = 52209978618096450, which 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 23 ways as a sum of consecutive naturals, for example, 5344 + ... + 18753.

It is an arithmetic number, because the mean of its divisors is an integer number (11747775).

Almost surely, 2^161570385 is an apocalyptic number.

161570385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161570385 is a deficient number, since it is larger than the sum of its proper divisors (120376215).

161570385 is a wasteful number, since it uses less digits than its factorization.

161570385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24257 (or 24254 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 161570385 is about 12711.0339862656. The cubic root of 161570385 is about 544.6538609527.

The spelling of 161570385 in words is "one hundred sixty-one million, five hundred seventy thousand, three hundred eighty-five".