65365661 has 2 divisors, whose sum is σ = 65365662. Its totient is φ = 65365660.

The previous prime is 65365649. The next prime is 65365667. The reversal of 65365661 is 16656356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62900761 + 2464900 = 7931^2 + 1570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65365661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65365667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32682830 + 32682831.

It is an arithmetic number, because the mean of its divisors is an integer number (32682831).

Almost surely, 2^65365661 is an apocalyptic number.

It is an amenable number.

65365661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65365661 is an equidigital number, since it uses as much as digits as its factorization.

65365661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 38.

The square root of 65365661 is about 8084.9032770961. The cubic root of 65365661 is about 402.8251267548.

The spelling of 65365661 in words is "sixty-five million, three hundred sixty-five thousand, six hundred sixty-one".