161570685 has 16 divisors (see below), whose sum is σ = 258781824. Its totient is φ = 86081472.

The previous prime is 161570657. The next prime is 161570713. The reversal of 161570685 is 586075161.

It is an interprime number because it is at equal distance from previous prime (161570657) and next prime (161570713).

It is not a de Polignac number, because 161570685 - 2⁶ = 161570621 is a prime.

It is a super-2 number, since 2×161570685² = 52210172502738450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10879 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (16173864).

Almost surely, 2^161570685 is an apocalyptic number.

161570685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161570685 is a deficient number, since it is larger than the sum of its proper divisors (97211139).

161570685 is a wasteful number, since it uses less digits than its factorization.

161570685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11204.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 161570685 is about 12711.0457870311. The cubic root of 161570685 is about 544.6541980526.

It can be divided in two parts, 161 and 570685, that added together give a triangular number (570846 = T₁₀₆₈).

The spelling of 161570685 in words is "one hundred sixty-one million, five hundred seventy thousand, six hundred eighty-five".