665026464 has 48 divisors (see below), whose sum is σ = 1753442208. Its totient is φ = 220691712.

The previous prime is 665026459. The next prime is 665026513. The reversal of 665026464 is 464620566.

It is a tau number, because it is divible by the number of its divisors (48).

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 7 ways as a sum of consecutive naturals, for example, 6534 + ... + 37050.

It is an arithmetic number, because the mean of its divisors is an integer number (36530046).

Almost surely, 2^665026464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665026464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876721104).

665026464 is an abundant number, since it is smaller than the sum of its proper divisors (1088415744).

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

665026464 is a wasteful number, since it uses less digits than its factorization.

665026464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30757 (or 30749 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 665026464 is about 25788.1070263019. The cubic root of 665026464 is about 872.8634518873.

The spelling of 665026464 in words is "six hundred sixty-five million, twenty-six thousand, four hundred sixty-four".