665322556 has 12 divisors (see below), whose sum is σ = 1167489568. Its totient is φ = 331754112.

The previous prime is 665322551. The next prime is 665322571. The reversal of 665322556 is 655223566.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665322551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225141 + ... + 228076.

Almost surely, 2^665322556 is an apocalyptic number.

It is an amenable number.

665322556 is a deficient number, since it is larger than the sum of its proper divisors (502167012).

665322556 is a wasteful number, since it uses less digits than its factorization.

665322556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453588 (or 453586 counting only the distinct ones).

The product of its digits is 324000, while the sum is 40.

The square root of 665322556 is about 25793.8472508465. The cubic root of 665322556 is about 872.9929753234.

The spelling of 665322556 in words is "six hundred sixty-five million, three hundred twenty-two thousand, five hundred fifty-six".