440664161 has 4 divisors (see below), whose sum is σ = 503616192. Its totient is φ = 377712132.

The previous prime is 440664139. The next prime is 440664173. The reversal of 440664161 is 161466044.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 440664161 - 2²² = 436469857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (440664121) 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, 31476005 + ... + 31476018.

It is an arithmetic number, because the mean of its divisors is an integer number (125904048).

Almost surely, 2^440664161 is an apocalyptic number.

It is an amenable number.

440664161 is a deficient number, since it is larger than the sum of its proper divisors (62952031).

440664161 is an equidigital number, since it uses as much as digits as its factorization.

440664161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62952030.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 440664161 is about 20992.0023104038. The cubic root of 440664161 is about 760.9729925956.

The spelling of 440664161 in words is "four hundred forty million, six hundred sixty-four thousand, one hundred sixty-one".