665427506 has 8 divisors (see below), whose sum is σ = 998307180. Its totient is φ = 332658448.

The previous prime is 665427487. The next prime is 665427571. The reversal of 665427506 is 605724566.

It can be written as a sum of positive squares in 2 ways, for example, as 573171481 + 92256025 = 23941^2 + 9605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10481 + ... + 37956.

Almost surely, 2^665427506 is an apocalyptic number.

665427506 is a deficient number, since it is larger than the sum of its proper divisors (332879674).

665427506 is a wasteful number, since it uses less digits than its factorization.

665427506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55308.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 665427506 is about 25795.8815705143. The cubic root of 665427506 is about 873.0388757642.

The spelling of 665427506 in words is "six hundred sixty-five million, four hundred twenty-seven thousand, five hundred six".