64802561 has 2 divisors, whose sum is σ = 64802562. Its totient is φ = 64802560.

The previous prime is 64802537. The next prime is 64802579. The reversal of 64802561 is 16520846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54760000 + 10042561 = 7400^2 + 3169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64802561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64802261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32401280 + 32401281.

It is an arithmetic number, because the mean of its divisors is an integer number (32401281).

Almost surely, 2^64802561 is an apocalyptic number.

It is an amenable number.

64802561 is a deficient number, since it is larger than the sum of its proper divisors (1).

64802561 is an equidigital number, since it uses as much as digits as its factorization.

64802561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 64802561 is about 8050.0037888190. The cubic root of 64802561 is about 401.6650613925.

The spelling of 64802561 in words is "sixty-four million, eight hundred two thousand, five hundred sixty-one".