665473536 has 480 divisors, whose sum is σ = 2534421120. Its totient is φ = 167878656.

The previous prime is 665473531. The next prime is 665473579. The reversal of 665473536 is 635374566.

665473536 is a `hidden beast` number, since 66 + 54 + 7 + 3 + 536 = 666.

Its product of digits (1360800) is a multiple of the sum of its prime divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 665473491 and 665473500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665473531) by changing a digit.

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, 28933621 + ... + 28933643.

It is an arithmetic number, because the mean of its divisors is an integer number (5280044).

Almost surely, 2^665473536 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 665473536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1267210560).

665473536 is an abundant number, since it is smaller than the sum of its proper divisors (1868947584).

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

665473536 is a wasteful number, since it uses less digits than its factorization.

665473536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 48 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 45.

The square root of 665473536 is about 25796.7737517698. The cubic root of 665473536 is about 873.0590057069.

The spelling of 665473536 in words is "six hundred sixty-five million, four hundred seventy-three thousand, five hundred thirty-six".