71208196991 has 2 divisors, whose sum is σ = 71208196992. Its totient is φ = 71208196990.

The previous prime is 71208196967. The next prime is 71208197023. The reversal of 71208196991 is 19969180217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71208196991 - 2²² = 71204002687 is a prime.

It is a super-2 number, since 2×71208196991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71208196291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35604098495 + 35604098496.

It is an arithmetic number, because the mean of its divisors is an integer number (35604098496).

Almost surely, 2^71208196991 is an apocalyptic number.

71208196991 is a deficient number, since it is larger than the sum of its proper divisors (1).

71208196991 is an equidigital number, since it uses as much as digits as its factorization.

71208196991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 71208196991 in words is "seventy-one billion, two hundred eight million, one hundred ninety-six thousand, nine hundred ninety-one".