3995851323681 has 24 divisors (see below), whose sum is σ = 6883122779520. Its totient is φ = 2184067803456.

The previous prime is 3995851323661. The next prime is 3995851323683. The reversal of 3995851323681 is 1863231585993.

It is a happy number.

3995851323681 is a `hidden beast` number, since 3 + 9 + 9 + 5 + 8 + 513 + 2 + 36 + 81 = 666.

It is not a de Polignac number, because 3995851323681 - 2⁶ = 3995851323617 is a prime.

It is a super-2 number, since 2×3995851323681² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (3995851323683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1378829236 + ... + 1378832133.

It is an arithmetic number, because the mean of its divisors is an integer number (286796782480).

Almost surely, 2^{3995851323681} is an apocalyptic number.

It is an amenable number.

3995851323681 is a deficient number, since it is larger than the sum of its proper divisors (2887271455839).

3995851323681 is a wasteful number, since it uses less digits than its factorization.

3995851323681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757661405 (or 2757661402 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 63.

The spelling of 3995851323681 in words is "three trillion, nine hundred ninety-five billion, eight hundred fifty-one million, three hundred twenty-three thousand, six hundred eighty-one".