665572 has 6 divisors (see below), whose sum is σ = 1164758. Its totient is φ = 332784.

The previous prime is 665569. The next prime is 665573. The reversal of 665572 is 275566.

665572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 224676 = 664^2 + 474^2 .

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83193 + ... + 83200.

2⁶⁶⁵⁵⁷² is an apocalyptic number.

It is an amenable number.

665572 is a deficient number, since it is larger than the sum of its proper divisors (499186).

665572 is a wasteful number, since it uses less digits than its factorization.

665572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166397 (or 166395 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 665572 is about 815.8259618325. The cubic root of 665572 is about 87.3102063088.

The spelling of 665572 in words is "six hundred sixty-five thousand, five hundred seventy-two".