71389781689 has 16 divisors (see below), whose sum is σ = 77124026880. Its totient is φ = 65871861120.

The previous prime is 71389781677. The next prime is 71389781699. The reversal of 71389781689 is 98618798317.

It is a cyclic number.

It is not a de Polignac number, because 71389781689 - 2¹⁷ = 71389650617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71389781669) 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, 120777 + ... + 396694.

It is an arithmetic number, because the mean of its divisors is an integer number (4820251680).

Almost surely, 2^71389781689 is an apocalyptic number.

It is an amenable number.

71389781689 is a deficient number, since it is larger than the sum of its proper divisors (5734245191).

71389781689 is a wasteful number, since it uses less digits than its factorization.

71389781689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517680.

The product of its digits is 36578304, while the sum is 67.

The spelling of 71389781689 in words is "seventy-one billion, three hundred eighty-nine million, seven hundred eighty-one thousand, six hundred eighty-nine".