65203661 has 2 divisors, whose sum is σ = 65203662. Its totient is φ = 65203660.

The previous prime is 65203637. The next prime is 65203667. The reversal of 65203661 is 16630256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 481636 = 8045^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 65203661 - 2¹⁴ = 65187277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65203667) 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 as a sum of consecutive naturals, namely, 32601830 + 32601831.

It is an arithmetic number, because the mean of its divisors is an integer number (32601831).

Almost surely, 2^65203661 is an apocalyptic number.

It is an amenable number.

65203661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65203661 is an equidigital number, since it uses as much as digits as its factorization.

65203661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 65203661 is about 8074.8783891771. The cubic root of 65203661 is about 402.4920688225.

The spelling of 65203661 in words is "sixty-five million, two hundred three thousand, six hundred sixty-one".