64981799 has 2 divisors, whose sum is σ = 64981800. Its totient is φ = 64981798.

The previous prime is 64981789. The next prime is 64981811. The reversal of 64981799 is 99718946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64981799 - 2⁴ = 64981783 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64981799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64981789) 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, 32490899 + 32490900.

It is an arithmetic number, because the mean of its divisors is an integer number (32490900).

Almost surely, 2^64981799 is an apocalyptic number.

64981799 is a deficient number, since it is larger than the sum of its proper divisors (1).

64981799 is an equidigital number, since it uses as much as digits as its factorization.

64981799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 64981799 is about 8061.1288911665. The cubic root of 64981799 is about 402.0350435198.

The spelling of 64981799 in words is "sixty-four million, nine hundred eighty-one thousand, seven hundred ninety-nine".