64611777188689 has 2 divisors, whose sum is σ = 64611777188690. Its totient is φ = 64611777188688.

The previous prime is 64611777188663. The next prime is 64611777188743. The reversal of 64611777188689 is 98688177711646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33085124369089 + 31526652819600 = 5751967^2 + 5614860^2 .

It is a cyclic number.

It is not a de Polignac number, because 64611777188689 - 2¹⁵ = 64611777155921 is a prime.

It is not a weakly prime, because it can be changed into another prime (64611777188639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32305888594344 + 32305888594345.

It is an arithmetic number, because the mean of its divisors is an integer number (32305888594345).

Almost surely, 2^{64611777188689} is an apocalyptic number.

It is an amenable number.

64611777188689 is a deficient number, since it is larger than the sum of its proper divisors (1).

64611777188689 is an equidigital number, since it uses as much as digits as its factorization.

64611777188689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1365590016, while the sum is 79.

The spelling of 64611777188689 in words is "sixty-four trillion, six hundred eleven billion, seven hundred seventy-seven million, one hundred eighty-eight thousand, six hundred eighty-nine".