64663180117 has 2 divisors, whose sum is σ = 64663180118. Its totient is φ = 64663180116.

The previous prime is 64663180069. The next prime is 64663180123. The reversal of 64663180117 is 71108136646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52695038916 + 11968141201 = 229554^2 + 109399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64663180117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64663180817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331590058 + 32331590059.

It is an arithmetic number, because the mean of its divisors is an integer number (32331590059).

Almost surely, 2^64663180117 is an apocalyptic number.

It is an amenable number.

64663180117 is a deficient number, since it is larger than the sum of its proper divisors (1).

64663180117 is an equidigital number, since it uses as much as digits as its factorization.

64663180117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 64663180117 in words is "sixty-four billion, six hundred sixty-three million, one hundred eighty thousand, one hundred seventeen".