665377854 has 8 divisors (see below), whose sum is σ = 1330755720. Its totient is φ = 221792616.

The previous prime is 665377759. The next prime is 665377897. The reversal of 665377854 is 458773566.

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

665377854 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 665377797 and 665377806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55448149 + ... + 55448160.

It is an arithmetic number, because the mean of its divisors is an integer number (166344465).

Almost surely, 2^665377854 is an apocalyptic number.

665377854 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.

665377854 is a wasteful number, since it uses less digits than its factorization.

665377854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110896314.

The product of its digits is 4233600, while the sum is 51.

The square root of 665377854 is about 25794.9191508716. The cubic root of 665377854 is about 873.0171607994.

The spelling of 665377854 in words is "six hundred sixty-five million, three hundred seventy-seven thousand, eight hundred fifty-four".