665913854 has 4 divisors (see below), whose sum is σ = 998870784. Its totient is φ = 332956926.

The previous prime is 665913823. The next prime is 665913869. The reversal of 665913854 is 458319566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 665913799 and 665913808.

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 as a sum of consecutive naturals, namely, 166478462 + ... + 166478465.

It is an arithmetic number, because the mean of its divisors is an integer number (249717696).

Almost surely, 2^665913854 is an apocalyptic number.

665913854 is a deficient number, since it is larger than the sum of its proper divisors (332956930).

665913854 is a wasteful number, since it uses less digits than its factorization.

665913854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332956929.

The product of its digits is 777600, while the sum is 47.

The square root of 665913854 is about 25805.3067023045. The cubic root of 665913854 is about 873.2515196686.

The spelling of 665913854 in words is "six hundred sixty-five million, nine hundred thirteen thousand, eight hundred fifty-four".