71847485789909 has 2 divisors, whose sum is σ = 71847485789910. Its totient is φ = 71847485789908.

The previous prime is 71847485789897. The next prime is 71847485789941. The reversal of 71847485789909 is 90998758474817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57768405905809 + 14079079884100 = 7600553^2 + 3752210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71847485789909 is a prime.

It is a super-2 number, since 2×71847485789909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71847485789969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35923742894954 + 35923742894955.

It is an arithmetic number, because the mean of its divisors is an integer number (35923742894955).

Almost surely, 2^{71847485789909} is an apocalyptic number.

It is an amenable number.

71847485789909 is a deficient number, since it is larger than the sum of its proper divisors (1).

71847485789909 is an equidigital number, since it uses as much as digits as its factorization.

71847485789909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10241925120, while the sum is 86.

The spelling of 71847485789909 in words is "seventy-one trillion, eight hundred forty-seven billion, four hundred eighty-five million, seven hundred eighty-nine thousand, nine hundred nine".