71181885042 has 24 divisors (see below), whose sum is σ = 154252420140. Its totient is φ = 23723448480.

The previous prime is 71181885013. The next prime is 71181885043. The reversal of 71181885042 is 24058818117.

It can be written as a sum of positive squares in 2 ways, for example, as 70996135401 + 185749641 = 266451^2 + 13629^2 .

It is not an unprimeable number, because it can be changed into a prime (71181885043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205309 + ... + 429552.

Almost surely, 2^71181885042 is an apocalyptic number.

71181885042 is an abundant number, since it is smaller than the sum of its proper divisors (83070535098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71181885042 is a wasteful number, since it uses less digits than its factorization.

71181885042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641098 (or 641095 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 71181885042 in words is "seventy-one billion, one hundred eighty-one million, eight hundred eighty-five thousand, forty-two".