664738692320 has 24 divisors (see below), whose sum is σ = 1570445160984. Its totient is φ = 265895476864.

The previous prime is 664738692269. The next prime is 664738692337. The reversal of 664738692320 is 23296837466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077308254 + ... + 2077308573.

It is an arithmetic number, because the mean of its divisors is an integer number (65435215041).

Almost surely, 2^664738692320 is an apocalyptic number.

It is an amenable number.

664738692320 is an abundant number, since it is smaller than the sum of its proper divisors (905706468664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664738692320 is a wasteful number, since it uses less digits than its factorization.

664738692320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154616842 (or 4154616834 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 664738692320 in words is "six hundred sixty-four billion, seven hundred thirty-eight million, six hundred ninety-two thousand, three hundred twenty".