664020885 has 16 divisors (see below), whose sum is σ = 1159018560. Its totient is φ = 321949440.

The previous prime is 664020881. The next prime is 664020947. The reversal of 664020885 is 588020466.

664020885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664020885 - 2² = 664020881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664020881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2012020 + ... + 2012349.

It is an arithmetic number, because the mean of its divisors is an integer number (72438660).

Almost surely, 2^664020885 is an apocalyptic number.

It is an amenable number.

664020885 is a deficient number, since it is larger than the sum of its proper divisors (494997675).

664020885 is a wasteful number, since it uses less digits than its factorization.

664020885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024388.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 664020885 is about 25768.6026978569. The cubic root of 664020885 is about 872.4232809668.

The spelling of 664020885 in words is "six hundred sixty-four million, twenty thousand, eight hundred eighty-five".