64659761 has 2 divisors, whose sum is σ = 64659762. Its totient is φ = 64659760.

The previous prime is 64659743. The next prime is 64659767. The reversal of 64659761 is 16795646.

It is a happy number.

64659761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33131536 + 31528225 = 5756^2 + 5615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64659761 is a prime.

It is not a weakly prime, because it can be changed into another prime (64659767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32329880 + 32329881.

It is an arithmetic number, because the mean of its divisors is an integer number (32329881).

Almost surely, 2^64659761 is an apocalyptic number.

It is an amenable number.

64659761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64659761 is an equidigital number, since it uses as much as digits as its factorization.

64659761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 64659761 is about 8041.1293361070. The cubic root of 64659761 is about 401.3698058087.

The spelling of 64659761 in words is "sixty-four million, six hundred fifty-nine thousand, seven hundred sixty-one".