665603405 has 8 divisors (see below), whose sum is σ = 799099872. Its totient is φ = 532232208.

The previous prime is 665603401. The next prime is 665603423. The reversal of 665603405 is 504306566.

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

It is a cyclic number.

It is not a de Polignac number, because 665603405 - 2² = 665603401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665603401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19199 + ... + 41228.

It is an arithmetic number, because the mean of its divisors is an integer number (99887484).

Almost surely, 2^665603405 is an apocalyptic number.

It is an amenable number.

665603405 is a deficient number, since it is larger than the sum of its proper divisors (133496467).

665603405 is a wasteful number, since it uses less digits than its factorization.

665603405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62635.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 665603405 is about 25799.2907848258. The cubic root of 665603405 is about 873.1157953056.

The spelling of 665603405 in words is "six hundred sixty-five million, six hundred three thousand, four hundred five".