65609779 has 2 divisors, whose sum is σ = 65609780. Its totient is φ = 65609778.

The previous prime is 65609767. The next prime is 65609801. The reversal of 65609779 is 97790656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65609779 - 2¹⁵ = 65577011 is a prime.

It is not a weakly prime, because it can be changed into another prime (65609729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32804889 + 32804890.

It is an arithmetic number, because the mean of its divisors is an integer number (32804890).

Almost surely, 2^65609779 is an apocalyptic number.

65609779 is a deficient number, since it is larger than the sum of its proper divisors (1).

65609779 is an equidigital number, since it uses as much as digits as its factorization.

65609779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 714420, while the sum is 49.

The square root of 65609779 is about 8099.9863580132. The cubic root of 65609779 is about 403.3259743362.

The spelling of 65609779 in words is "sixty-five million, six hundred nine thousand, seven hundred seventy-nine".