3631661018 has 16 divisors (see below), whose sum is σ = 5685653736. Its totient is φ = 1738114560.

The previous prime is 3631661003. The next prime is 3631661041. The reversal of 3631661018 is 8101661363.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3061740889 + 569920129 = 55333^2 + 23873^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413471 + ... + 422162.

Almost surely, 2^3631661018 is an apocalyptic number.

3631661018 is a deficient number, since it is larger than the sum of its proper divisors (2053992718).

3631661018 is a wasteful number, since it uses less digits than its factorization.

3631661018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835729.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 3631661018 is about 60263.2642494580. The cubic root of 3631661018 is about 1537.0987455161.

The spelling of 3631661018 in words is "three billion, six hundred thirty-one million, six hundred sixty-one thousand, eighteen".