64565261 has 2 divisors, whose sum is σ = 64565262. Its totient is φ = 64565260.

The previous prime is 64565251. The next prime is 64565273. The reversal of 64565261 is 16256546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64096036 + 469225 = 8006^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 64565261 - 2¹⁸ = 64303117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64565251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32282630 + 32282631.

It is an arithmetic number, because the mean of its divisors is an integer number (32282631).

Almost surely, 2^64565261 is an apocalyptic number.

It is an amenable number.

64565261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64565261 is an equidigital number, since it uses as much as digits as its factorization.

64565261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 64565261 is about 8035.2511472884. The cubic root of 64565261 is about 401.1741769818.

The spelling of 64565261 in words is "sixty-four million, five hundred sixty-five thousand, two hundred sixty-one".