3872821877691 has 16 divisors (see below), whose sum is σ = 5589203314464. Its totient is φ = 2371177154304.

The previous prime is 3872821877653. The next prime is 3872821877699. The reversal of 3872821877691 is 1967781282783.

It is a de Polignac number, because none of the positive numbers 2^k-3872821877691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3872821877699) 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 15 ways as a sum of consecutive naturals, for example, 252030706 + ... + 252046071.

It is an arithmetic number, because the mean of its divisors is an integer number (349325207154).

Almost surely, 2^{3872821877691} is an apocalyptic number.

3872821877691 is a deficient number, since it is larger than the sum of its proper divisors (1716381436773).

3872821877691 is a wasteful number, since it uses less digits than its factorization.

3872821877691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504076990.

The product of its digits is 113799168, while the sum is 69.

The spelling of 3872821877691 in words is "three trillion, eight hundred seventy-two billion, eight hundred twenty-one million, eight hundred seventy-seven thousand, six hundred ninety-one".