3991625686408 has 32 divisors (see below), whose sum is σ = 7496265168000. Its totient is φ = 1992623497920.

The previous prime is 3991625686403. The next prime is 3991625686459. The reversal of 3991625686408 is 8046865261993.

It is not an unprimeable number, because it can be changed into a prime (3991625686403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17350033 + ... + 17578591.

It is an arithmetic number, because the mean of its divisors is an integer number (234258286500).

Almost surely, 2^{3991625686408} is an apocalyptic number.

It is an amenable number.

3991625686408 is a deficient number, since it is larger than the sum of its proper divisors (3504639481592).

3991625686408 is a wasteful number, since it uses less digits than its factorization.

3991625686408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232045 (or 232041 counting only the distinct ones).

The product of its (nonzero) digits is 134369280, while the sum is 67.

The spelling of 3991625686408 in words is "three trillion, nine hundred ninety-one billion, six hundred twenty-five million, six hundred eighty-six thousand, four hundred eight".