665173432 has 192 divisors, whose sum is σ = 1743379200. Its totient is φ = 234178560.

The previous prime is 665173429. The next prime is 665173447. The reversal of 665173432 is 234371566.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665173391 and 665173400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1884168 + ... + 1884520.

It is an arithmetic number, because the mean of its divisors is an integer number (9080100).

Almost surely, 2^665173432 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 665173432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871689600).

665173432 is an abundant number, since it is smaller than the sum of its proper divisors (1078205768).

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

665173432 is a wasteful number, since it uses less digits than its factorization.

665173432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 415 counting only the distinct ones).

The product of its digits is 90720, while the sum is 37.

The square root of 665173432 is about 25790.9563994824. The cubic root of 665173432 is about 872.9277468459.

The spelling of 665173432 in words is "six hundred sixty-five million, one hundred seventy-three thousand, four hundred thirty-two".