71800580557 has 4 divisors (see below), whose sum is σ = 71812762236. Its totient is φ = 71788398880.

The previous prime is 71800580513. The next prime is 71800580563. The reversal of 71800580557 is 75508500817.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64327669641 + 7472910916 = 253629^2 + 86446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71800580557 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 (71800580507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6081994 + ... + 6093787.

It is an arithmetic number, because the mean of its divisors is an integer number (17953190559).

Almost surely, 2^71800580557 is an apocalyptic number.

It is an amenable number.

71800580557 is a deficient number, since it is larger than the sum of its proper divisors (12181679).

71800580557 is a wasteful number, since it uses less digits than its factorization.

71800580557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12181678.

The product of its (nonzero) digits is 392000, while the sum is 46.

The spelling of 71800580557 in words is "seventy-one billion, eight hundred million, five hundred eighty thousand, five hundred fifty-seven".