64816559 has 2 divisors, whose sum is σ = 64816560. Its totient is φ = 64816558.

The previous prime is 64816547. The next prime is 64816579. The reversal of 64816559 is 95561846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64816559 - 2¹² = 64812463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64816519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32408279 + 32408280.

It is an arithmetic number, because the mean of its divisors is an integer number (32408280).

Almost surely, 2^64816559 is an apocalyptic number.

64816559 is a deficient number, since it is larger than the sum of its proper divisors (1).

64816559 is an equidigital number, since it uses as much as digits as its factorization.

64816559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 44.

The square root of 64816559 is about 8050.8731824567. The cubic root of 64816559 is about 401.6939805312.

The spelling of 64816559 in words is "sixty-four million, eight hundred sixteen thousand, five hundred fifty-nine".