664782855 has 16 divisors (see below), whose sum is σ = 1160348544. Its totient is φ = 322318880.

The previous prime is 664782829. The next prime is 664782883. The reversal of 664782855 is 558287466.

It is a happy number.

It is not a de Polignac number, because 664782855 - 2⁶ = 664782791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664782798 and 664782807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2014329 + ... + 2014658.

It is an arithmetic number, because the mean of its divisors is an integer number (72521784).

Almost surely, 2^664782855 is an apocalyptic number.

664782855 is a deficient number, since it is larger than the sum of its proper divisors (495565689).

664782855 is a wasteful number, since it uses less digits than its factorization.

664782855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029006.

The product of its digits is 3225600, while the sum is 51.

The square root of 664782855 is about 25783.3833117378. The cubic root of 664782855 is about 872.7568579528.

The spelling of 664782855 in words is "six hundred sixty-four million, seven hundred eighty-two thousand, eight hundred fifty-five".