3881326566 has 64 divisors (see below), whose sum is σ = 8620774848. Its totient is φ = 1157234688.

The previous prime is 3881326531. The next prime is 3881326591. The reversal of 3881326566 is 6656231883.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 739086 + ... + 744318.

It is an arithmetic number, because the mean of its divisors is an integer number (134699607).

Almost surely, 2^3881326566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3881326566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4310387424).

3881326566 is an abundant number, since it is smaller than the sum of its proper divisors (4739448282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3881326566 is a wasteful number, since it uses less digits than its factorization.

3881326566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545.

The product of its digits is 1244160, while the sum is 48.

The square root of 3881326566 is about 62300.2934664035. The cubic root of 3881326566 is about 1571.5446636539.

The spelling of 3881326566 in words is "three billion, eight hundred eighty-one million, three hundred twenty-six thousand, five hundred sixty-six".