665429472 has 96 divisors (see below), whose sum is σ = 1986082560. Its totient is φ = 216639360.

The previous prime is 665429441. The next prime is 665429473. The reversal of 665429472 is 274924566.

665429472 is a `hidden beast` number, since 66 + 542 + 9 + 47 + 2 = 666.

665429472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665429473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28197 + ... + 46107.

It is an arithmetic number, because the mean of its divisors is an integer number (20688360).

Almost surely, 2^665429472 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 665429472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993041280).

665429472 is an abundant number, since it is smaller than the sum of its proper divisors (1320653088).

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

665429472 is a wasteful number, since it uses less digits than its factorization.

665429472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17973 (or 17959 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 665429472 is about 25795.9196773443. The cubic root of 665429472 is about 873.0397355587.

The spelling of 665429472 in words is "six hundred sixty-five million, four hundred twenty-nine thousand, four hundred seventy-two".