71857611447 has 4 divisors (see below), whose sum is σ = 95810148600. Its totient is φ = 47905074296.

The previous prime is 71857611409. The next prime is 71857611461. The reversal of 71857611447 is 74411675817.

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

It is a cyclic number.

It is not a de Polignac number, because 71857611447 - 2⁶ = 71857611383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71857611447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71857611487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11976268572 + ... + 11976268577.

It is an arithmetic number, because the mean of its divisors is an integer number (23952537150).

Almost surely, 2^71857611447 is an apocalyptic number.

71857611447 is a deficient number, since it is larger than the sum of its proper divisors (23952537153).

71857611447 is a wasteful number, since it uses less digits than its factorization.

71857611447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23952537152.

The product of its digits is 1317120, while the sum is 51.

The spelling of 71857611447 in words is "seventy-one billion, eight hundred fifty-seven million, six hundred eleven thousand, four hundred forty-seven".