3665965601 has 4 divisors (see below), whose sum is σ = 3692724612. Its totient is φ = 3639206592.

The previous prime is 3665965579. The next prime is 3665965637. The reversal of 3665965601 is 1065695663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1065695663 = 449 ⋅2373487.

It can be written as a sum of positive squares in 2 ways, for example, as 1247784976 + 2418180625 = 35324^2 + 49175^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665965601 - 2²² = 3661771297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3665965201) 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, 13379300 + ... + 13379573.

It is an arithmetic number, because the mean of its divisors is an integer number (923181153).

Almost surely, 2^3665965601 is an apocalyptic number.

It is an amenable number.

3665965601 is a deficient number, since it is larger than the sum of its proper divisors (26759011).

3665965601 is a wasteful number, since it uses less digits than its factorization.

3665965601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26759010.

The product of its (nonzero) digits is 874800, while the sum is 47.

The square root of 3665965601 is about 60547.2179459965. The cubic root of 3665965601 is about 1541.9233854224.

The spelling of 3665965601 in words is "three billion, six hundred sixty-five million, nine hundred sixty-five thousand, six hundred one".