64509799 has 2 divisors, whose sum is σ = 64509800. Its totient is φ = 64509798.

The previous prime is 64509793. The next prime is 64509821. The reversal of 64509799 is 99790546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64509799 - 2⁹ = 64509287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64509793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32254899 + 32254900.

It is an arithmetic number, because the mean of its divisors is an integer number (32254900).

Almost surely, 2^64509799 is an apocalyptic number.

64509799 is a deficient number, since it is larger than the sum of its proper divisors (1).

64509799 is an equidigital number, since it uses as much as digits as its factorization.

64509799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 64509799 is about 8031.7992380288. The cubic root of 64509799 is about 401.0592736223.

The spelling of 64509799 in words is "sixty-four million, five hundred nine thousand, seven hundred ninety-nine".