3968415581489 has 4 divisors (see below), whose sum is σ = 3968531607156. Its totient is φ = 3968299555824.

The previous prime is 3968415581437. The next prime is 3968415581531. The reversal of 3968415581489 is 9841855148693.

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 2692175416225 + 1276240165264 = 1640785^2 + 1129708^2 .

It is a cyclic number.

It is not a de Polignac number, because 3968415581489 - 2²⁰ = 3968414532913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3968415551489) 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, 57961514 + ... + 58029939.

It is an arithmetic number, because the mean of its divisors is an integer number (992132901789).

Almost surely, 2^{3968415581489} is an apocalyptic number.

It is an amenable number.

3968415581489 is a deficient number, since it is larger than the sum of its proper divisors (116025667).

3968415581489 is a wasteful number, since it uses less digits than its factorization.

3968415581489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116025666.

The product of its digits is 298598400, while the sum is 71.

The spelling of 3968415581489 in words is "three trillion, nine hundred sixty-eight billion, four hundred fifteen million, five hundred eighty-one thousand, four hundred eighty-nine".