71993155271 has 2 divisors, whose sum is σ = 71993155272. Its totient is φ = 71993155270.

The previous prime is 71993155243. The next prime is 71993155327. The reversal of 71993155271 is 17255139917.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71993155271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71993155231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35996577635 + 35996577636.

It is an arithmetic number, because the mean of its divisors is an integer number (35996577636).

Almost surely, 2^71993155271 is an apocalyptic number.

71993155271 is a deficient number, since it is larger than the sum of its proper divisors (1).

71993155271 is an equidigital number, since it uses as much as digits as its factorization.

71993155271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595350, while the sum is 50.

The spelling of 71993155271 in words is "seventy-one billion, nine hundred ninety-three million, one hundred fifty-five thousand, two hundred seventy-one".