3996865041664 has 72 divisors (see below), whose sum is σ = 8712876876480. Its totient is φ = 1814778777600.

The previous prime is 3996865041541. The next prime is 3996865041667. The reversal of 3996865041664 is 4661405686993.

It is a super-2 number, since 2×3996865041664² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3996865041664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3996865041667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1815684 + ... + 3360124.

It is an arithmetic number, because the mean of its divisors is an integer number (121012178840).

Almost surely, 2^{3996865041664} 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 3996865041664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4356438438240).

3996865041664 is an abundant number, since it is smaller than the sum of its proper divisors (4716011834816).

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

3996865041664 is a wasteful number, since it uses less digits than its factorization.

3996865041664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545387 (or 1545373 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 67.

The spelling of 3996865041664 in words is "three trillion, nine hundred ninety-six billion, eight hundred sixty-five million, forty-one thousand, six hundred sixty-four".