64187899516729 has 2 divisors, whose sum is σ = 64187899516730. Its totient is φ = 64187899516728.

The previous prime is 64187899516721. The next prime is 64187899516843. The reversal of 64187899516729 is 92761599878146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62975969347600 + 1211930169129 = 7935740^2 + 1100877^2 .

It is a cyclic number.

It is not a de Polignac number, because 64187899516729 - 2³ = 64187899516721 is a prime.

It is not a weakly prime, because it can be changed into another prime (64187899516721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32093949758364 + 32093949758365.

It is an arithmetic number, because the mean of its divisors is an integer number (32093949758365).

Almost surely, 2^{64187899516729} is an apocalyptic number.

It is an amenable number.

64187899516729 is a deficient number, since it is larger than the sum of its proper divisors (1).

64187899516729 is an equidigital number, since it uses as much as digits as its factorization.

64187899516729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3292047360, while the sum is 82.

The spelling of 64187899516729 in words is "sixty-four trillion, one hundred eighty-seven billion, eight hundred ninety-nine million, five hundred sixteen thousand, seven hundred twenty-nine".