665989486 has 8 divisors (see below), whose sum is σ = 1023349824. Its totient is φ = 324872880.

The previous prime is 665989481. The next prime is 665989517. The reversal of 665989486 is 684989566.

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 (665989481) 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, 4060830 + ... + 4060993.

It is an arithmetic number, because the mean of its divisors is an integer number (127918728).

Almost surely, 2^665989486 is an apocalyptic number.

665989486 is a deficient number, since it is larger than the sum of its proper divisors (357360338).

665989486 is a wasteful number, since it uses less digits than its factorization.

665989486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8121866.

The product of its digits is 22394880, while the sum is 61.

The square root of 665989486 is about 25806.7720957116. The cubic root of 665989486 is about 873.2845786287.

The spelling of 665989486 in words is "six hundred sixty-five million, nine hundred eighty-nine thousand, four hundred eighty-six".