65638473877 has 2 divisors, whose sum is σ = 65638473878. Its totient is φ = 65638473876.

The previous prime is 65638473871. The next prime is 65638473881. The reversal of 65638473877 is 77837483656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58939215076 + 6699258801 = 242774^2 + 81849^2 .

It is a cyclic number.

It is not a de Polignac number, because 65638473877 - 2²⁷ = 65504256149 is a prime.

It is a super-2 number, since 2×65638473877² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65638473871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32819236938 + 32819236939.

It is an arithmetic number, because the mean of its divisors is an integer number (32819236939).

Almost surely, 2^65638473877 is an apocalyptic number.

It is an amenable number.

65638473877 is a deficient number, since it is larger than the sum of its proper divisors (1).

65638473877 is an equidigital number, since it uses as much as digits as its factorization.

65638473877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142248960, while the sum is 64.

The spelling of 65638473877 in words is "sixty-five billion, six hundred thirty-eight million, four hundred seventy-three thousand, eight hundred seventy-seven".