64559400191999 has 16 divisors (see below), whose sum is σ = 65513415372000. Its totient is φ = 63611814499200.

The previous prime is 64559400191989. The next prime is 64559400192029. The reversal of 64559400191999 is 99919100495546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64559400191999 is a prime.

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64559400191929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49757597 + ... + 51038585.

It is an arithmetic number, because the mean of its divisors is an integer number (4094588460750).

Almost surely, 2^{64559400191999} is an apocalyptic number.

64559400191999 is a deficient number, since it is larger than the sum of its proper divisors (954015180001).

64559400191999 is a wasteful number, since it uses less digits than its factorization.

64559400191999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283498.

The product of its (nonzero) digits is 141717600, while the sum is 71.

The spelling of 64559400191999 in words is "sixty-four trillion, five hundred fifty-nine billion, four hundred million, one hundred ninety-one thousand, nine hundred ninety-nine".