77171644623 has 4 divisors (see below), whose sum is σ = 102895526168. Its totient is φ = 51447763080.

The previous prime is 77171644607. The next prime is 77171644639. The reversal of 77171644623 is 32644617177.

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

It is an interprime number because it is at equal distance from previous prime (77171644607) and next prime (77171644639).

It is not a de Polignac number, because 77171644623 - 2⁴ = 77171644607 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 (77171643623) 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, 12861940768 + ... + 12861940773.

It is an arithmetic number, because the mean of its divisors is an integer number (25723881542).

Almost surely, 2^77171644623 is an apocalyptic number.

77171644623 is a deficient number, since it is larger than the sum of its proper divisors (25723881545).

77171644623 is a wasteful number, since it uses less digits than its factorization.

77171644623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25723881544.

The product of its digits is 1185408, while the sum is 48.

The spelling of 77171644623 in words is "seventy-seven billion, one hundred seventy-one million, six hundred forty-four thousand, six hundred twenty-three".