161217407465 has 4 divisors (see below), whose sum is σ = 193460888964. Its totient is φ = 128973925968.

The previous prime is 161217407447. The next prime is 161217407543. The reversal of 161217407465 is 564704712161.

161217407465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103908877801 + 57308529664 = 322349^2 + 239392^2 .

It is a cyclic number.

It is not a de Polignac number, because 161217407465 - 2¹⁸ = 161217145321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16121740742 + ... + 16121740751.

It is an arithmetic number, because the mean of its divisors is an integer number (48365222241).

Almost surely, 2^161217407465 is an apocalyptic number.

It is an amenable number.

161217407465 is a deficient number, since it is larger than the sum of its proper divisors (32243481499).

161217407465 is an equidigital number, since it uses as much as digits as its factorization.

161217407465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32243481498.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 161217407465 in words is "one hundred sixty-one billion, two hundred seventeen million, four hundred seven thousand, four hundred sixty-five".