71571953811 has 4 divisors (see below), whose sum is σ = 95429271752. Its totient is φ = 47714635872.

The previous prime is 71571953797. The next prime is 71571953813. The reversal of 71571953811 is 11835917517.

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

It is not a de Polignac number, because 71571953811 - 2¹⁰ = 71571952787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71571953813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11928658966 + ... + 11928658971.

It is an arithmetic number, because the mean of its divisors is an integer number (23857317938).

Almost surely, 2^71571953811 is an apocalyptic number.

71571953811 is a deficient number, since it is larger than the sum of its proper divisors (23857317941).

71571953811 is a wasteful number, since it uses less digits than its factorization.

71571953811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23857317940.

The product of its digits is 264600, while the sum is 48.

The spelling of 71571953811 in words is "seventy-one billion, five hundred seventy-one million, nine hundred fifty-three thousand, eight hundred eleven".