71515858643 has 2 divisors, whose sum is σ = 71515858644. Its totient is φ = 71515858642.

The previous prime is 71515858571. The next prime is 71515858649. The reversal of 71515858643 is 34685851517.

It is a strong prime.

It is an emirp because it is prime and its reverse (34685851517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71515858643 - 2¹⁸ = 71515596499 is a prime.

It is a super-2 number, since 2×71515858643² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (71515858649) 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, 35757929321 + 35757929322.

It is an arithmetic number, because the mean of its divisors is an integer number (35757929322).

Almost surely, 2^71515858643 is an apocalyptic number.

71515858643 is a deficient number, since it is larger than the sum of its proper divisors (1).

71515858643 is an equidigital number, since it uses as much as digits as its factorization.

71515858643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 53.

The spelling of 71515858643 in words is "seventy-one billion, five hundred fifteen million, eight hundred fifty-eight thousand, six hundred forty-three".