72645617664223 has 4 divisors (see below), whose sum is σ = 72646553330080. Its totient is φ = 72644681998368.

The previous prime is 72645617664211. The next prime is 72645617664227. The reversal of 72645617664223 is 32246671654627.

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

It is a cyclic number.

It is not a de Polignac number, because 72645617664223 - 2⁹ = 72645617663711 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 (72645617664227) 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, 467716458 + ... + 467871751.

It is an arithmetic number, because the mean of its divisors is an integer number (18161638332520).

Almost surely, 2^{72645617664223} is an apocalyptic number.

72645617664223 is a deficient number, since it is larger than the sum of its proper divisors (935665857).

72645617664223 is an equidigital number, since it uses as much as digits as its factorization.

72645617664223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935665856.

The product of its digits is 121927680, while the sum is 61.

The spelling of 72645617664223 in words is "seventy-two trillion, six hundred forty-five billion, six hundred seventeen million, six hundred sixty-four thousand, two hundred twenty-three".