71661844003 has 4 divisors (see below), whose sum is σ = 71662483728. Its totient is φ = 71661204280.

The previous prime is 71661843991. The next prime is 71661844039. The reversal of 71661844003 is 30044816617.

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: 30044816617 = 1091 ⋅27538787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71661844003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71661841003) 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, 102676 + ... + 392257.

It is an arithmetic number, because the mean of its divisors is an integer number (17915620932).

Almost surely, 2^71661844003 is an apocalyptic number.

71661844003 is a deficient number, since it is larger than the sum of its proper divisors (639725).

71661844003 is a wasteful number, since it uses less digits than its factorization.

71661844003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639724.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 71661844003 in words is "seventy-one billion, six hundred sixty-one million, eight hundred forty-four thousand, three".