3988359878861 has 4 divisors (see below), whose sum is σ = 3988515075552. Its totient is φ = 3988204682172.

The previous prime is 3988359878849. The next prime is 3988359878953. The reversal of 3988359878861 is 1688789538893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3988359878861 - 2³⁸ = 3713481971917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3988359878861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988359878821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77559791 + ... + 77611196.

It is an arithmetic number, because the mean of its divisors is an integer number (997128768888).

Almost surely, 2^{3988359878861} is an apocalyptic number.

It is an amenable number.

3988359878861 is a deficient number, since it is larger than the sum of its proper divisors (155196691).

3988359878861 is a wasteful number, since it uses less digits than its factorization.

3988359878861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155196690.

The product of its digits is 5016453120, while the sum is 83.

The spelling of 3988359878861 in words is "three trillion, nine hundred eighty-eight billion, three hundred fifty-nine million, eight hundred seventy-eight thousand, eight hundred sixty-one".