71663398971 has 8 divisors (see below), whose sum is σ = 95553356304. Its totient is φ = 47774520480.

The previous prime is 71663398951. The next prime is 71663398987. The reversal of 71663398971 is 17989336617.

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

It is not a de Polignac number, because 71663398971 - 2⁶ = 71663398907 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (71663398931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99340 + ... + 391401.

It is an arithmetic number, because the mean of its divisors is an integer number (11944169538).

Almost surely, 2^71663398971 is an apocalyptic number.

71663398971 is a deficient number, since it is larger than the sum of its proper divisors (23889957333).

71663398971 is a wasteful number, since it uses less digits than its factorization.

71663398971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539421.

The product of its digits is 10287648, while the sum is 60.

The spelling of 71663398971 in words is "seventy-one billion, six hundred sixty-three million, three hundred ninety-eight thousand, nine hundred seventy-one".