71894603218 has 4 divisors (see below), whose sum is σ = 107841904830. Its totient is φ = 35947301608.

The previous prime is 71894603201. The next prime is 71894603299. The reversal of 71894603218 is 81230649817.

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

It can be written as a sum of positive squares in only one way, i.e., 62441513689 + 9453089529 = 249883^2 + 97227^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17973650803 + ... + 17973650806.

Almost surely, 2^71894603218 is an apocalyptic number.

71894603218 is a deficient number, since it is larger than the sum of its proper divisors (35947301612).

71894603218 is a wasteful number, since it uses less digits than its factorization.

71894603218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35947301611.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 71894603218 in words is "seventy-one billion, eight hundred ninety-four million, six hundred three thousand, two hundred eighteen".