72768658649 has 4 divisors (see below), whose sum is σ = 72769323264. Its totient is φ = 72767994036.

The previous prime is 72768658643. The next prime is 72768658679. The reversal of 72768658649 is 94685686727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94685686727 = 14071 ⋅6729137.

It is a cyclic number.

It is not a de Polignac number, because 72768658649 - 2²⁰ = 72767610073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72768658643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124937 + ... + 401430.

It is an arithmetic number, because the mean of its divisors is an integer number (18192330816).

Almost surely, 2^72768658649 is an apocalyptic number.

It is an amenable number.

72768658649 is a deficient number, since it is larger than the sum of its proper divisors (664615).

72768658649 is a wasteful number, since it uses less digits than its factorization.

72768658649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664614.

The product of its digits is 243855360, while the sum is 68.

The spelling of 72768658649 in words is "seventy-two billion, seven hundred sixty-eight million, six hundred fifty-eight thousand, six hundred forty-nine".