71745675647 has 4 divisors (see below), whose sum is σ = 71746241160. Its totient is φ = 71745110136.

The previous prime is 71745675641. The next prime is 71745675707. The reversal of 71745675647 is 74657654717.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74657654717 = 89 ⋅838850053.

It is a cyclic number.

It is not a de Polignac number, because 71745675647 - 2¹⁸ = 71745413503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71745675641) 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, 5504 + ... + 378842.

It is an arithmetic number, because the mean of its divisors is an integer number (17936560290).

Almost surely, 2^71745675647 is an apocalyptic number.

71745675647 is a deficient number, since it is larger than the sum of its proper divisors (565513).

71745675647 is a wasteful number, since it uses less digits than its factorization.

71745675647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565512.

The product of its digits is 34574400, while the sum is 59.

The spelling of 71745675647 in words is "seventy-one billion, seven hundred forty-five million, six hundred seventy-five thousand, six hundred forty-seven".