65638473871 has 2 divisors, whose sum is σ = 65638473872. Its totient is φ = 65638473870.

The previous prime is 65638473853. The next prime is 65638473877. The reversal of 65638473871 is 17837483656.

65638473871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65638473871 - 2⁷ = 65638473743 is a prime.

It is a super-2 number, since 2×65638473871² (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 (65638473877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32819236935 + 32819236936.

It is an arithmetic number, because the mean of its divisors is an integer number (32819236936).

Almost surely, 2^65638473871 is an apocalyptic number.

65638473871 is a deficient number, since it is larger than the sum of its proper divisors (1).

65638473871 is an equidigital number, since it uses as much as digits as its factorization.

65638473871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 58.

The spelling of 65638473871 in words is "sixty-five billion, six hundred thirty-eight million, four hundred seventy-three thousand, eight hundred seventy-one".