71664594623 has 4 divisors (see below), whose sum is σ = 73189373280. Its totient is φ = 70139815968.

The previous prime is 71664594601. The next prime is 71664594679. The reversal of 71664594623 is 32649546617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32649546617 = 22469 ⋅1453093.

It is a cyclic number.

It is not a de Polignac number, because 71664594623 - 2¹⁴ = 71664578239 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 (71664524623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762389258 + ... + 762389351.

It is an arithmetic number, because the mean of its divisors is an integer number (18297343320).

Almost surely, 2^71664594623 is an apocalyptic number.

71664594623 is a deficient number, since it is larger than the sum of its proper divisors (1524778657).

71664594623 is a wasteful number, since it uses less digits than its factorization.

71664594623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524778656.

The product of its digits is 6531840, while the sum is 53.

The spelling of 71664594623 in words is "seventy-one billion, six hundred sixty-four million, five hundred ninety-four thousand, six hundred twenty-three".