64186873493 has 2 divisors, whose sum is σ = 64186873494. Its totient is φ = 64186873492.

The previous prime is 64186873453. The next prime is 64186873511. The reversal of 64186873493 is 39437868146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36771130564 + 27415742929 = 191758^2 + 165577^2 .

It is a cyclic number.

It is not a de Polignac number, because 64186873493 - 2¹⁶ = 64186807957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64186873433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32093436746 + 32093436747.

It is an arithmetic number, because the mean of its divisors is an integer number (32093436747).

Almost surely, 2^64186873493 is an apocalyptic number.

It is an amenable number.

64186873493 is a deficient number, since it is larger than the sum of its proper divisors (1).

64186873493 is an equidigital number, since it uses as much as digits as its factorization.

64186873493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 59.

The spelling of 64186873493 in words is "sixty-four billion, one hundred eighty-six million, eight hundred seventy-three thousand, four hundred ninety-three".