3875181661 has 12 divisors (see below), whose sum is σ = 4197990720. Its totient is φ = 3575566800.

The previous prime is 3875181551. The next prime is 3875181683. The reversal of 3875181661 is 1661815783.

It is not a de Polignac number, because 3875181661 - 2⁷ = 3875181533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3875151661) 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 11 ways as a sum of consecutive naturals, for example, 659386 + ... + 665236.

It is an arithmetic number, because the mean of its divisors is an integer number (349832560).

Almost surely, 2^3875181661 is an apocalyptic number.

It is an amenable number.

3875181661 is a deficient number, since it is larger than the sum of its proper divisors (322809059).

3875181661 is a wasteful number, since it uses less digits than its factorization.

3875181661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9796 (or 9783 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 3875181661 is about 62250.9571091080. The cubic root of 3875181661 is about 1570.7148706014.

The spelling of 3875181661 in words is "three billion, eight hundred seventy-five million, one hundred eighty-one thousand, six hundred sixty-one".