161807965 has 32 divisors (see below), whose sum is σ = 220579200. Its totient is φ = 112869120.

The previous prime is 161807957. The next prime is 161807983. The reversal of 161807965 is 569708161.

It is a happy number.

It is not a de Polignac number, because 161807965 - 2³ = 161807957 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 365034 + ... + 365476.

It is an arithmetic number, because the mean of its divisors is an integer number (6893100).

Almost surely, 2^161807965 is an apocalyptic number.

It is an amenable number.

161807965 is a deficient number, since it is larger than the sum of its proper divisors (58771235).

161807965 is a wasteful number, since it uses less digits than its factorization.

161807965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 161807965 is about 12720.3759771478. The cubic root of 161807965 is about 544.9206909817.

The spelling of 161807965 in words is "one hundred sixty-one million, eight hundred seven thousand, nine hundred sixty-five".