65809657 has 2 divisors, whose sum is σ = 65809658. Its totient is φ = 65809656.

The previous prime is 65809649. The next prime is 65809661. The reversal of 65809657 is 75690856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52186176 + 13623481 = 7224^2 + 3691^2 .

It is a cyclic number.

It is not a de Polignac number, because 65809657 - 2³ = 65809649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65803657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32904828 + 32904829.

It is an arithmetic number, because the mean of its divisors is an integer number (32904829).

Almost surely, 2^65809657 is an apocalyptic number.

It is an amenable number.

65809657 is a deficient number, since it is larger than the sum of its proper divisors (1).

65809657 is an equidigital number, since it uses as much as digits as its factorization.

65809657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 65809657 is about 8112.3151442729. The cubic root of 65809657 is about 403.7351321577.

It can be divided in two parts, 65809 and 657, that added together give a palindrome (66466).

The spelling of 65809657 in words is "sixty-five million, eight hundred nine thousand, six hundred fifty-seven".