665405534 has 8 divisors (see below), whose sum is σ = 1056820608. Its totient is φ = 313132000.

The previous prime is 665405519. The next prime is 665405537. The reversal of 665405534 is 435504566.

It is a happy number.

665405534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665405537) 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, 9785342 + ... + 9785409.

It is an arithmetic number, because the mean of its divisors is an integer number (132102576).

Almost surely, 2^665405534 is an apocalyptic number.

665405534 is a deficient number, since it is larger than the sum of its proper divisors (391415074).

665405534 is a wasteful number, since it uses less digits than its factorization.

665405534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570770.

The product of its (nonzero) digits is 216000, while the sum is 38.

The square root of 665405534 is about 25795.4556850620. The cubic root of 665405534 is about 873.0292665925.

The spelling of 665405534 in words is "six hundred sixty-five million, four hundred five thousand, five hundred thirty-four".