65197816549 has 2 divisors, whose sum is σ = 65197816550. Its totient is φ = 65197816548.

The previous prime is 65197816531. The next prime is 65197816657. The reversal of 65197816549 is 94561879156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57591360324 + 7606456225 = 239982^2 + 87215^2 .

It is a cyclic number.

It is not a de Polignac number, because 65197816549 - 2⁵ = 65197816517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65197316549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32598908274 + 32598908275.

It is an arithmetic number, because the mean of its divisors is an integer number (32598908275).

Almost surely, 2^65197816549 is an apocalyptic number.

It is an amenable number.

65197816549 is a deficient number, since it is larger than the sum of its proper divisors (1).

65197816549 is an equidigital number, since it uses as much as digits as its factorization.

65197816549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 61.

The spelling of 65197816549 in words is "sixty-five billion, one hundred ninety-seven million, eight hundred sixteen thousand, five hundred forty-nine".