3991523619903 has 8 divisors (see below), whose sum is σ = 5337108071088. Its totient is φ = 2653477457664.

The previous prime is 3991523619883. The next prime is 3991523619929. The reversal of 3991523619903 is 3099163251993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3991523619903 - 2³⁷ = 3854084666431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991523612903) 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, 1884571000 + ... + 1884573117.

It is an arithmetic number, because the mean of its divisors is an integer number (667138508886).

Almost surely, 2^{3991523619903} is an apocalyptic number.

3991523619903 is a deficient number, since it is larger than the sum of its proper divisors (1345584451185).

3991523619903 is a wasteful number, since it uses less digits than its factorization.

3991523619903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769144473.

The product of its (nonzero) digits is 10628820, while the sum is 60.

The spelling of 3991523619903 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-three million, six hundred nineteen thousand, nine hundred three".