665055424 has 56 divisors (see below), whose sum is σ = 1474872336. Its totient is φ = 294912000.

The previous prime is 665055421. The next prime is 665055473. The reversal of 665055424 is 424550566.

It is not an unprimeable number, because it can be changed into a prime (665055421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17344 + ... + 40384.

It is an arithmetic number, because the mean of its divisors is an integer number (26337006).

Almost surely, 2^665055424 is an apocalyptic number.

665055424 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 665055424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737436168).

665055424 is an abundant number, since it is smaller than the sum of its proper divisors (809816912).

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

665055424 is a wasteful number, since it uses less digits than its factorization.

665055424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23105 (or 23095 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 665055424 is about 25788.6685193323. The cubic root of 665055424 is about 872.8761219388.

The spelling of 665055424 in words is "six hundred sixty-five million, fifty-five thousand, four hundred twenty-four".