3946007663681 has 4 divisors (see below), whose sum is σ = 3946022188164. Its totient is φ = 3945993139200.

The previous prime is 3946007663651. The next prime is 3946007663737. The reversal of 3946007663681 is 1863667006493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3724128040000 + 221879623681 = 1929800^2 + 471041^2 .

It is a cyclic number.

It is not a de Polignac number, because 3946007663681 - 2³⁰ = 3944933921857 is a prime.

It is a super-2 number, since 2×3946007663681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3946007663681.

It is not an unprimeable number, because it can be changed into a prime (3946007663641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6846800 + ... + 7400721.

It is an arithmetic number, because the mean of its divisors is an integer number (986505547041).

Almost surely, 2^{3946007663681} is an apocalyptic number.

It is an amenable number.

3946007663681 is a deficient number, since it is larger than the sum of its proper divisors (14524483).

3946007663681 is a wasteful number, since it uses less digits than its factorization.

3946007663681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14524482.

The product of its (nonzero) digits is 23514624, while the sum is 59.

The spelling of 3946007663681 in words is "three trillion, nine hundred forty-six billion, seven million, six hundred sixty-three thousand, six hundred eighty-one".