71859418909 has 8 divisors (see below), whose sum is σ = 73807760088. Its totient is φ = 69911403840.

The previous prime is 71859418879. The next prime is 71859418951. The reversal of 71859418909 is 90981495817.

It can be written as a sum of positive squares in 4 ways, for example, as 42977436100 + 28881982809 = 207310^2 + 169947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71859418909 - 2²⁹ = 71322547997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71859478909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403779 + ... + 553855.

It is an arithmetic number, because the mean of its divisors is an integer number (9225970011).

Almost surely, 2^71859418909 is an apocalyptic number.

It is an amenable number.

71859418909 is a deficient number, since it is larger than the sum of its proper divisors (1948341179).

71859418909 is a wasteful number, since it uses less digits than its factorization.

71859418909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163055.

The product of its (nonzero) digits is 6531840, while the sum is 61.

The spelling of 71859418909 in words is "seventy-one billion, eight hundred fifty-nine million, four hundred eighteen thousand, nine hundred nine".