664085820886 has 16 divisors (see below), whose sum is σ = 997786172448. Its totient is φ = 331490656000.

The previous prime is 664085820809. The next prime is 664085820917. The reversal of 664085820886 is 688028580466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6102246 + ... + 6210118.

It is an arithmetic number, because the mean of its divisors is an integer number (62361635778).

Almost surely, 2^664085820886 is an apocalyptic number.

664085820886 is a deficient number, since it is larger than the sum of its proper divisors (333700351562).

664085820886 is a wasteful number, since it uses less digits than its factorization.

664085820886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112967.

The product of its (nonzero) digits is 35389440, while the sum is 61.

The spelling of 664085820886 in words is "six hundred sixty-four billion, eighty-five million, eight hundred twenty thousand, eight hundred eighty-six".