71658667811 has 2 divisors, whose sum is σ = 71658667812. Its totient is φ = 71658667810.

The previous prime is 71658667807. The next prime is 71658667823. The reversal of 71658667811 is 11876685617.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71658667811 - 2² = 71658667807 is a prime.

It is not a weakly prime, because it can be changed into another prime (71658667831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35829333905 + 35829333906.

It is an arithmetic number, because the mean of its divisors is an integer number (35829333906).

Almost surely, 2^71658667811 is an apocalyptic number.

71658667811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71658667811 is an equidigital number, since it uses as much as digits as its factorization.

71658667811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 56.

The spelling of 71658667811 in words is "seventy-one billion, six hundred fifty-eight million, six hundred sixty-seven thousand, eight hundred eleven".