71732643893 has 2 divisors, whose sum is σ = 71732643894. Its totient is φ = 71732643892.

The previous prime is 71732643799. The next prime is 71732643937. The reversal of 71732643893 is 39834623717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65220476689 + 6512167204 = 255383^2 + 80698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71732643893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71732643193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35866321946 + 35866321947.

It is an arithmetic number, because the mean of its divisors is an integer number (35866321947).

Almost surely, 2^71732643893 is an apocalyptic number.

It is an amenable number.

71732643893 is a deficient number, since it is larger than the sum of its proper divisors (1).

71732643893 is an equidigital number, since it uses as much as digits as its factorization.

71732643893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 53.

The spelling of 71732643893 in words is "seventy-one billion, seven hundred thirty-two million, six hundred forty-three thousand, eight hundred ninety-three".