71445878961889 has 2 divisors, whose sum is σ = 71445878961890. Its totient is φ = 71445878961888.

The previous prime is 71445878961887. The next prime is 71445878961911. The reversal of 71445878961889 is 98816987854417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40821774412864 + 30624104549025 = 6389192^2 + 5533905^2 .

It is a cyclic number.

It is not a de Polignac number, because 71445878961889 - 2¹ = 71445878961887 is a prime.

Together with 71445878961887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71445878961887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35722939480944 + 35722939480945.

It is an arithmetic number, because the mean of its divisors is an integer number (35722939480945).

Almost surely, 2^{71445878961889} is an apocalyptic number.

It is an amenable number.

71445878961889 is a deficient number, since it is larger than the sum of its proper divisors (1).

71445878961889 is an equidigital number, since it uses as much as digits as its factorization.

71445878961889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7803371520, while the sum is 85.

The spelling of 71445878961889 in words is "seventy-one trillion, four hundred forty-five billion, eight hundred seventy-eight million, nine hundred sixty-one thousand, eight hundred eighty-nine".