64897370117 has 2 divisors, whose sum is σ = 64897370118. Its totient is φ = 64897370116.

The previous prime is 64897370089. The next prime is 64897370177. The reversal of 64897370117 is 71107379846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58692814756 + 6204555361 = 242266^2 + 78769^2 .

It is a cyclic number.

It is not a de Polignac number, because 64897370117 - 2⁸ = 64897369861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64897370177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32448685058 + 32448685059.

It is an arithmetic number, because the mean of its divisors is an integer number (32448685059).

Almost surely, 2^64897370117 is an apocalyptic number.

It is an amenable number.

64897370117 is a deficient number, since it is larger than the sum of its proper divisors (1).

64897370117 is an equidigital number, since it uses as much as digits as its factorization.

64897370117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 64897370117 in words is "sixty-four billion, eight hundred ninety-seven million, three hundred seventy thousand, one hundred seventeen".