71661489693 has 8 divisors (see below), whose sum is σ = 95929325856. Its totient is φ = 47583990000.

The previous prime is 71661489649. The next prime is 71661489721. The reversal of 71661489693 is 39698416617.

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

It is not a de Polignac number, because 71661489693 - 2⁹ = 71661489181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71661489623) 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, 47583238 + ... + 47584743.

It is an arithmetic number, because the mean of its divisors is an integer number (11991165732).

Almost surely, 2^71661489693 is an apocalyptic number.

It is an amenable number.

71661489693 is a deficient number, since it is larger than the sum of its proper divisors (24267836163).

71661489693 is a wasteful number, since it uses less digits than its factorization.

71661489693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95168235.

The product of its digits is 11757312, while the sum is 60.

The spelling of 71661489693 in words is "seventy-one billion, six hundred sixty-one million, four hundred eighty-nine thousand, six hundred ninety-three".