72565817847 has 4 divisors (see below), whose sum is σ = 96754423800. Its totient is φ = 48377211896.

The previous prime is 72565817843. The next prime is 72565817851. The reversal of 72565817847 is 74871856527.

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 (72565817843) and next prime (72565817851).

It is a cyclic number.

It is not a de Polignac number, because 72565817847 - 2² = 72565817843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72565817843) 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, 12094302972 + ... + 12094302977.

It is an arithmetic number, because the mean of its divisors is an integer number (24188605950).

Almost surely, 2^72565817847 is an apocalyptic number.

72565817847 is a deficient number, since it is larger than the sum of its proper divisors (24188605953).

72565817847 is a wasteful number, since it uses less digits than its factorization.

72565817847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24188605952.

The product of its digits is 26342400, while the sum is 60.

The spelling of 72565817847 in words is "seventy-two billion, five hundred sixty-five million, eight hundred seventeen thousand, eight hundred forty-seven".