161885807 has 4 divisors (see below), whose sum is σ = 161955960. Its totient is φ = 161815656.

The previous prime is 161885803. The next prime is 161885809. The reversal of 161885807 is 708588161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708588161 = 719 ⋅985519.

It is a cyclic number.

It is not a de Polignac number, because 161885807 - 2² = 161885803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161885803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31493 + ... + 36270.

It is an arithmetic number, because the mean of its divisors is an integer number (40488990).

Almost surely, 2^161885807 is an apocalyptic number.

161885807 is a deficient number, since it is larger than the sum of its proper divisors (70153).

161885807 is an equidigital number, since it uses as much as digits as its factorization.

161885807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70152.

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 161885807 is about 12723.4353458490. The cubic root of 161885807 is about 545.0080598084.

The spelling of 161885807 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, eight hundred seven".