71545223249 has 2 divisors, whose sum is σ = 71545223250. Its totient is φ = 71545223248.

The previous prime is 71545223173. The next prime is 71545223261. The reversal of 71545223249 is 94232254517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70692174400 + 853048849 = 265880^2 + 29207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71545223249 is a prime.

It is not a weakly prime, because it can be changed into another prime (71545223149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35772611624 + 35772611625.

It is an arithmetic number, because the mean of its divisors is an integer number (35772611625).

Almost surely, 2^71545223249 is an apocalyptic number.

It is an amenable number.

71545223249 is a deficient number, since it is larger than the sum of its proper divisors (1).

71545223249 is an equidigital number, since it uses as much as digits as its factorization.

71545223249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 44.

The spelling of 71545223249 in words is "seventy-one billion, five hundred forty-five million, two hundred twenty-three thousand, two hundred forty-nine".