39664892218644 has 384 divisors, whose sum is σ = 128469804503040. Its totient is φ = 10281696768000.

The previous prime is 39664892218643. The next prime is 39664892218667. The reversal of 39664892218644 is 44681229846693.

It is a happy number.

39664892218644 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 489 + 2 + 21 + 86 + 44 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39664892218643) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14160974044 + ... + 14160976844.

It is an arithmetic number, because the mean of its divisors is an integer number (334556782560).

Almost surely, 2^{39664892218644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39664892218644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64234902251520).

39664892218644 is an abundant number, since it is smaller than the sum of its proper divisors (88804912284396).

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

39664892218644 is a wasteful number, since it uses less digits than its factorization.

39664892218644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676 (or 5668 counting only the distinct ones).

The product of its digits is 859963392, while the sum is 72.

The spelling of 39664892218644 in words is "thirty-nine trillion, six hundred sixty-four billion, eight hundred ninety-two million, two hundred eighteen thousand, six hundred forty-four".