161432865 has 32 divisors (see below), whose sum is σ = 313084800. Its totient is φ = 78269760.

The previous prime is 161432861. The next prime is 161432899. The reversal of 161432865 is 568234161.

It is a happy number.

161432865 is a `hidden beast` number, since 1 + 614 + 32 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 161432865 - 2² = 161432861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161432861) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 52870 + ... + 55839.

It is an arithmetic number, because the mean of its divisors is an integer number (9783900).

Almost surely, 2^161432865 is an apocalyptic number.

161432865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161432865 is a deficient number, since it is larger than the sum of its proper divisors (151651935).

161432865 is a wasteful number, since it uses less digits than its factorization.

161432865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108734 (or 108728 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161432865 is about 12705.6233613310. The cubic root of 161432865 is about 544.4992904240.

The spelling of 161432865 in words is "one hundred sixty-one million, four hundred thirty-two thousand, eight hundred sixty-five".