665610464 has 48 divisors (see below), whose sum is σ = 1371359808. Its totient is φ = 317670912.

The previous prime is 665610443. The next prime is 665610479. The reversal of 665610464 is 464016566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57449 + ... + 68055.

It is an arithmetic number, because the mean of its divisors is an integer number (28569996).

Almost surely, 2^665610464 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 665610464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685679904).

665610464 is an abundant number, since it is smaller than the sum of its proper divisors (705749344).

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

665610464 is a wasteful number, since it uses less digits than its factorization.

665610464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10707 (or 10699 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 665610464 is about 25799.4275905494. The cubic root of 665610464 is about 873.1188818797.

The spelling of 665610464 in words is "six hundred sixty-five million, six hundred ten thousand, four hundred sixty-four".