71681735218 has 8 divisors (see below), whose sum is σ = 107597640348. Its totient is φ = 35815855104.

The previous prime is 71681735143. The next prime is 71681735221. The reversal of 71681735218 is 81253718617.

It can be written as a sum of positive squares in 2 ways, for example, as 59026160209 + 12655575009 = 242953^2 + 112497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12502671 + ... + 12508402.

Almost surely, 2^71681735218 is an apocalyptic number.

71681735218 is a deficient number, since it is larger than the sum of its proper divisors (35915905130).

71681735218 is a wasteful number, since it uses less digits than its factorization.

71681735218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25012508.

The product of its digits is 564480, while the sum is 49.

The spelling of 71681735218 in words is "seventy-one billion, six hundred eighty-one million, seven hundred thirty-five thousand, two hundred eighteen".