65664077 has 2 divisors, whose sum is σ = 65664078. Its totient is φ = 65664076.

The previous prime is 65664073. The next prime is 65664097. The reversal of 65664077 is 77046656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63186601 + 2477476 = 7949^2 + 1574^2 .

It is a cyclic number.

It is not a de Polignac number, because 65664077 - 2² = 65664073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65664073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32832038 + 32832039.

It is an arithmetic number, because the mean of its divisors is an integer number (32832039).

Almost surely, 2^65664077 is an apocalyptic number.

It is an amenable number.

65664077 is a deficient number, since it is larger than the sum of its proper divisors (1).

65664077 is an equidigital number, since it uses as much as digits as its factorization.

65664077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 65664077 is about 8103.3373988746. The cubic root of 65664077 is about 403.4372065108.

The spelling of 65664077 in words is "sixty-five million, six hundred sixty-four thousand, seventy-seven".