3631601665 has 4 divisors (see below), whose sum is σ = 4357922004. Its totient is φ = 2905281328.

The previous prime is 3631601663. The next prime is 3631601669. The reversal of 3631601665 is 5661061363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661061363 = 22669 ⋅249727.

It can be written as a sum of positive squares in 2 ways, for example, as 2139247504 + 1492354161 = 46252^2 + 38631^2 .

It is a cyclic number.

It is not a de Polignac number, because 3631601665 - 2¹ = 3631601663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3631601663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363160162 + ... + 363160171.

It is an arithmetic number, because the mean of its divisors is an integer number (1089480501).

Almost surely, 2^3631601665 is an apocalyptic number.

It is an amenable number.

3631601665 is a deficient number, since it is larger than the sum of its proper divisors (726320339).

3631601665 is an equidigital number, since it uses as much as digits as its factorization.

3631601665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726320338.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 3631601665 is about 60262.7717998434. The cubic root of 3631601665 is about 1537.0903717611.

The spelling of 3631601665 in words is "three billion, six hundred thirty-one million, six hundred one thousand, six hundred sixty-five".