665470080 has 384 divisors, whose sum is σ = 2606385600. Its totient is φ = 160911360.

The previous prime is 665470073. The next prime is 665470093. The reversal of 665470080 is 80074566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1710526 + ... + 1710914.

Almost surely, 2^665470080 is an apocalyptic number.

665470080 is a gapful number since it is divisible by the number (60) 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 665470080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303192800).

665470080 is an abundant number, since it is smaller than the sum of its proper divisors (1940915520).

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

665470080 is a wasteful number, since it uses less digits than its factorization.

665470080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 665470080 is about 25796.7067665623. The cubic root of 665470080 is about 873.0574943535.

The spelling of 665470080 in words is "six hundred sixty-five million, four hundred seventy thousand, eighty".