64187384544817 has 2 divisors, whose sum is σ = 64187384544818. Its totient is φ = 64187384544816.

The previous prime is 64187384544809. The next prime is 64187384544827. The reversal of 64187384544817 is 71844548378146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54976426622881 + 9210957921936 = 7414609^2 + 3034956^2 .

It is a cyclic number.

It is not a de Polignac number, because 64187384544817 - 2³ = 64187384544809 is a prime.

It is not a weakly prime, because it can be changed into another prime (64187384544827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32093692272408 + 32093692272409.

It is an arithmetic number, because the mean of its divisors is an integer number (32093692272409).

Almost surely, 2^{64187384544817} is an apocalyptic number.

It is an amenable number.

64187384544817 is a deficient number, since it is larger than the sum of its proper divisors (1).

64187384544817 is an equidigital number, since it uses as much as digits as its factorization.

64187384544817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 578027520, while the sum is 70.

The spelling of 64187384544817 in words is "sixty-four trillion, one hundred eighty-seven billion, three hundred eighty-four million, five hundred forty-four thousand, eight hundred seventeen".