71881920692218 has 32 divisors (see below), whose sum is σ = 132911468839296. Its totient is φ = 28392578543808.

The previous prime is 71881920692213. The next prime is 71881920692243. The reversal of 71881920692218 is 81229602918817.

It is a self number, because there is not a number n which added to its sum of digits gives 71881920692218.

It is not an unprimeable number, because it can be changed into a prime (71881920692213) 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, 307002421 + ... + 307236472.

It is an arithmetic number, because the mean of its divisors is an integer number (4153483401228).

Almost surely, 2^{71881920692218} is an apocalyptic number.

71881920692218 is a deficient number, since it is larger than the sum of its proper divisors (61029548147078).

71881920692218 is a wasteful number, since it uses less digits than its factorization.

71881920692218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614239558.

The product of its (nonzero) digits is 13934592, while the sum is 64.

The spelling of 71881920692218 in words is "seventy-one trillion, eight hundred eighty-one billion, nine hundred twenty million, six hundred ninety-two thousand, two hundred eighteen".