665086464 has 400 divisors, whose sum is σ = 2376633600. Its totient is φ = 181149696.

The previous prime is 665086459. The next prime is 665086481. The reversal of 665086464 is 464680566.

665086464 is a `hidden beast` number, since 66 + 50 + 86 + 464 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8418777 + ... + 8418855.

It is an arithmetic number, because the mean of its divisors is an integer number (5941584).

Almost surely, 2^665086464 is an apocalyptic number.

665086464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665086464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188316800).

665086464 is an abundant number, since it is smaller than the sum of its proper divisors (1711547136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665086464 is an equidigital number, since it uses as much as digits as its factorization.

665086464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The square root of 665086464 is about 25789.2703270178. The cubic root of 665086464 is about 872.8897015856.

The spelling of 665086464 in words is "six hundred sixty-five million, eighty-six thousand, four hundred sixty-four".