3665603261 has 2 divisors, whose sum is σ = 3665603262. Its totient is φ = 3665603260.

The previous prime is 3665603203. The next prime is 3665603287. The reversal of 3665603261 is 1623065663.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3444516100 + 221087161 = 58690^2 + 14869^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665603261 - 2¹⁴ = 3665586877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3665602261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832801630 + 1832801631.

It is an arithmetic number, because the mean of its divisors is an integer number (1832801631).

Almost surely, 2^3665603261 is an apocalyptic number.

It is an amenable number.

3665603261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3665603261 is an equidigital number, since it uses as much as digits as its factorization.

3665603261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 3665603261 is about 60544.2256619077. The cubic root of 3665603261 is about 1541.8725830793.

The spelling of 3665603261 in words is "three billion, six hundred sixty-five million, six hundred three thousand, two hundred sixty-one".