665175672 has 128 divisors (see below), whose sum is σ = 2120025600. Its totient is φ = 189298944.

The previous prime is 665175671. The next prime is 665175691. The reversal of 665175672 is 276571566.

665175672 is a `hidden beast` number, since 66 + 517 + 5 + 6 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665175671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 463468 + ... + 464900.

It is an arithmetic number, because the mean of its divisors is an integer number (16562700).

Almost surely, 2^665175672 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 665175672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060012800).

665175672 is an abundant number, since it is smaller than the sum of its proper divisors (1454849928).

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

665175672 is a wasteful number, since it uses less digits than its factorization.

665175672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 1752 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 665175672 is about 25790.9998255205. Note that the first 3 decimals coincide. The cubic root of 665175672 is about 872.9287267187.

The spelling of 665175672 in words is "six hundred sixty-five million, one hundred seventy-five thousand, six hundred seventy-two".