665665534 has 8 divisors (see below), whose sum is σ = 1011137760. Its totient is φ = 328619616.

The previous prime is 665665529. The next prime is 665665537. The reversal of 665665534 is 435566566.

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

It is a super-2 number, since 2×665665534² = 886221206311010312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665665537) 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, 2106379 + ... + 2106694.

It is an arithmetic number, because the mean of its divisors is an integer number (126392220).

Almost surely, 2^665665534 is an apocalyptic number.

665665534 is a deficient number, since it is larger than the sum of its proper divisors (345472226).

665665534 is a wasteful number, since it uses less digits than its factorization.

665665534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213154.

The product of its digits is 1944000, while the sum is 46.

The square root of 665665534 is about 25800.4948402158. The cubic root of 665665534 is about 873.1429606933.

The spelling of 665665534 in words is "six hundred sixty-five million, six hundred sixty-five thousand, five hundred thirty-four".