65655661 has 2 divisors, whose sum is σ = 65655662. Its totient is φ = 65655660.

The previous prime is 65655641. The next prime is 65655671. The reversal of 65655661 is 16655656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 26842761 = 6230^2 + 5181^2 .

It is a cyclic number.

It is not a de Polignac number, because 65655661 - 2²⁵ = 32101229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65655631) 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, 32827830 + 32827831.

It is an arithmetic number, because the mean of its divisors is an integer number (32827831).

Almost surely, 2^65655661 is an apocalyptic number.

It is an amenable number.

65655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65655661 is an equidigital number, since it uses as much as digits as its factorization.

65655661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 40.

The square root of 65655661 is about 8102.8180900228. The cubic root of 65655661 is about 403.4199699296.

The spelling of 65655661 in words is "sixty-five million, six hundred fifty-five thousand, six hundred sixty-one".