161858585 has 8 divisors (see below), whose sum is σ = 221977536. Its totient is φ = 110988720.

The previous prime is 161858573. The next prime is 161858617. The reversal of 161858585 is 585858161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161858585 - 2¹⁴ = 161842201 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2312231 + ... + 2312300.

It is an arithmetic number, because the mean of its divisors is an integer number (27747192).

Almost surely, 2^161858585 is an apocalyptic number.

It is an amenable number.

161858585 is a deficient number, since it is larger than the sum of its proper divisors (60118951).

161858585 is an equidigital number, since it uses as much as digits as its factorization.

161858585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624543.

The product of its digits is 384000, while the sum is 47.

The square root of 161858585 is about 12722.3655426182. The cubic root of 161858585 is about 544.9775093825.

The spelling of 161858585 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, five hundred eighty-five".