665662605 has 8 divisors (see below), whose sum is σ = 1065060192. Its totient is φ = 355020048.

The previous prime is 665662583. The next prime is 665662631. The reversal of 665662605 is 506266566.

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

It is not a de Polignac number, because 665662605 - 2⁶ = 665662541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22188739 + ... + 22188768.

It is an arithmetic number, because the mean of its divisors is an integer number (133132524).

Almost surely, 2^665662605 is an apocalyptic number.

It is an amenable number.

665662605 is a deficient number, since it is larger than the sum of its proper divisors (399397587).

665662605 is a wasteful number, since it uses less digits than its factorization.

665662605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44377515.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 665662605 is about 25800.4380776761. The cubic root of 665662605 is about 873.1416800504.

The spelling of 665662605 in words is "six hundred sixty-five million, six hundred sixty-two thousand, six hundred five".