71945909398919 has 2 divisors, whose sum is σ = 71945909398920. Its totient is φ = 71945909398918.

The previous prime is 71945909398849. The next prime is 71945909398931. The reversal of 71945909398919 is 91989390954917.

It is a strong prime.

It is an emirp because it is prime and its reverse (91989390954917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71945909398919 - 2¹⁶ = 71945909333383 is a prime.

It is a super-2 number, since 2×71945909398919² (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 (71945909368919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35972954699459 + 35972954699460.

It is an arithmetic number, because the mean of its divisors is an integer number (35972954699460).

Almost surely, 2^{71945909398919} is an apocalyptic number.

71945909398919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71945909398919 is an equidigital number, since it uses as much as digits as its factorization.

71945909398919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1785641760, while the sum is 83.

The spelling of 71945909398919 in words is "seventy-one trillion, nine hundred forty-five billion, nine hundred nine million, three hundred ninety-eight thousand, nine hundred nineteen".