3621827661 has 32 divisors (see below), whose sum is σ = 5128704000. Its totient is φ = 2269713600.

The previous prime is 3621827659. The next prime is 3621827669. The reversal of 3621827661 is 1667281263.

It is not a de Polignac number, because 3621827661 - 2¹ = 3621827659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621827669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 811486 + ... + 815936.

It is an arithmetic number, because the mean of its divisors is an integer number (160272000).

Almost surely, 2^3621827661 is an apocalyptic number.

It is an amenable number.

3621827661 is a deficient number, since it is larger than the sum of its proper divisors (1506876339).

3621827661 is a wasteful number, since it uses less digits than its factorization.

3621827661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729.

The product of its digits is 145152, while the sum is 42.

The square root of 3621827661 is about 60181.6222862096. The cubic root of 3621827661 is about 1535.7101703144.

The spelling of 3621827661 in words is "three billion, six hundred twenty-one million, eight hundred twenty-seven thousand, six hundred sixty-one".