71503971523 has 2 divisors, whose sum is σ = 71503971524. Its totient is φ = 71503971522.

The previous prime is 71503971359. The next prime is 71503971557. The reversal of 71503971523 is 32517930517.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71503971523 - 2¹⁷ = 71503840451 is a prime.

It is a super-2 number, since 2×71503971523² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71503971523.

It is not a weakly prime, because it can be changed into another prime (71503971923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35751985761 + 35751985762.

It is an arithmetic number, because the mean of its divisors is an integer number (35751985762).

Almost surely, 2^71503971523 is an apocalyptic number.

71503971523 is a deficient number, since it is larger than the sum of its proper divisors (1).

71503971523 is an equidigital number, since it uses as much as digits as its factorization.

71503971523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 198450, while the sum is 43.

The spelling of 71503971523 in words is "seventy-one billion, five hundred three million, nine hundred seventy-one thousand, five hundred twenty-three".