665726032 has 10 divisors (see below), whose sum is σ = 1289844218. Its totient is φ = 332863008.

The previous prime is 665726021. The next prime is 665726041. The reversal of 665726032 is 230627566.

It can be written as a sum of positive squares in only one way, i.e., 632824336 + 32901696 = 25156^2 + 5736^2 .

It is a super-2 number, since 2×665726032² = 886382299364930048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665725982 and 665726000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20803923 + ... + 20803954.

Almost surely, 2^665726032 is an apocalyptic number.

It is an amenable number.

665726032 is a deficient number, since it is larger than the sum of its proper divisors (624118186).

665726032 is a wasteful number, since it uses less digits than its factorization.

665726032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41607885 (or 41607879 counting only the distinct ones).

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

The square root of 665726032 is about 25801.6672329522. The cubic root of 665726032 is about 873.1694113155.

The spelling of 665726032 in words is "six hundred sixty-five million, seven hundred twenty-six thousand, thirty-two".