71818043189 has 8 divisors (see below), whose sum is σ = 72327604440. Its totient is φ = 71309721600.

The previous prime is 71818043153. The next prime is 71818043239. The reversal of 71818043189 is 98134081817.

It can be written as a sum of positive squares in 4 ways, for example, as 19495140625 + 52322902564 = 139625^2 + 228742^2 .

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 71818043189 - 2¹² = 71818039093 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 (71818043119) 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, 193484 + ... + 425525.

It is an arithmetic number, because the mean of its divisors is an integer number (9040950555).

Almost surely, 2^71818043189 is an apocalyptic number.

It is an amenable number.

71818043189 is a deficient number, since it is larger than the sum of its proper divisors (509561251).

71818043189 is a wasteful number, since it uses less digits than its factorization.

71818043189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619831.

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 71818043189 in words is "seventy-one billion, eight hundred eighteen million, forty-three thousand, one hundred eighty-nine".