65490857 has 2 divisors, whose sum is σ = 65490858. Its totient is φ = 65490856.

The previous prime is 65490847. The next prime is 65490869. The reversal of 65490857 is 75809456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60777616 + 4713241 = 7796^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 65490857 - 2⁶ = 65490793 is a prime.

It is not a weakly prime, because it can be changed into another prime (65490847) 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, 32745428 + 32745429.

It is an arithmetic number, because the mean of its divisors is an integer number (32745429).

Almost surely, 2^65490857 is an apocalyptic number.

It is an amenable number.

65490857 is a deficient number, since it is larger than the sum of its proper divisors (1).

65490857 is an equidigital number, since it uses as much as digits as its factorization.

65490857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 65490857 is about 8092.6421519798. The cubic root of 65490857 is about 403.0821420856.

The spelling of 65490857 in words is "sixty-five million, four hundred ninety thousand, eight hundred fifty-seven".