71090511985 has 16 divisors (see below), whose sum is σ = 88331673600. Its totient is φ = 54860654016.

The previous prime is 71090511983. The next prime is 71090512027. The reversal of 71090511985 is 58911509017.

It is a cyclic number.

It is not a de Polignac number, because 71090511985 - 2¹ = 71090511983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71090511983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67905 + ... + 383134.

It is an arithmetic number, because the mean of its divisors is an integer number (5520729600).

Almost surely, 2^71090511985 is an apocalyptic number.

It is an amenable number.

71090511985 is a deficient number, since it is larger than the sum of its proper divisors (17241161615).

71090511985 is a wasteful number, since it uses less digits than its factorization.

71090511985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452160.

The product of its (nonzero) digits is 113400, while the sum is 46.

The spelling of 71090511985 in words is "seventy-one billion, ninety million, five hundred eleven thousand, nine hundred eighty-five".