64993840129 has 16 divisors (see below), whose sum is σ = 69299850240. Its totient is φ = 60854472000.

The previous prime is 64993840111. The next prime is 64993840147. The reversal of 64993840129 is 92104839946.

It is an interprime number because it is at equal distance from previous prime (64993840111) and next prime (64993840147).

It is a cyclic number.

It is not a de Polignac number, because 64993840129 - 2¹⁹ = 64993315841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64993840129.

It is not an unprimeable number, because it can be changed into a prime (64993840729) 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 in 15 ways as a sum of consecutive naturals, for example, 133137 + ... + 384334.

It is an arithmetic number, because the mean of its divisors is an integer number (4331240640).

Almost surely, 2^64993840129 is an apocalyptic number.

It is an amenable number.

64993840129 is a deficient number, since it is larger than the sum of its proper divisors (4306010111).

64993840129 is a wasteful number, since it uses less digits than its factorization.

64993840129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517632.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 64993840129 in words is "sixty-four billion, nine hundred ninety-three million, eight hundred forty thousand, one hundred twenty-nine".