665793906 has 8 divisors (see below), whose sum is σ = 1331587824. Its totient is φ = 221931300.

The previous prime is 665793889. The next prime is 665793907. The reversal of 665793906 is 609397566.

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

665793906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (665793907) 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, 55482820 + ... + 55482831.

It is an arithmetic number, because the mean of its divisors is an integer number (166448478).

Almost surely, 2^665793906 is an apocalyptic number.

665793906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665793906 is a wasteful number, since it uses less digits than its factorization.

665793906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110965656.

The product of its (nonzero) digits is 1837080, while the sum is 51.

The square root of 665793906 is about 25802.9825020287. The cubic root of 665793906 is about 873.1990849268.

The spelling of 665793906 in words is "six hundred sixty-five million, seven hundred ninety-three thousand, nine hundred six".