768449847921 has 32 divisors (see below), whose sum is σ = 1173087710208. Its totient is φ = 438320963520.

The previous prime is 768449847917. The next prime is 768449847947. The reversal of 768449847921 is 129748944867.

768449847921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 768449847921 - 2² = 768449847917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (768449847721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52158126 + ... + 52172856.

It is an arithmetic number, because the mean of its divisors is an integer number (36658990944).

Almost surely, 2^768449847921 is an apocalyptic number.

It is an amenable number.

768449847921 is a deficient number, since it is larger than the sum of its proper divisors (404637862287).

768449847921 is a wasteful number, since it uses less digits than its factorization.

768449847921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19061.

The product of its digits is 195084288, while the sum is 69.

The spelling of 768449847921 in words is "seven hundred sixty-eight billion, four hundred forty-nine million, eight hundred forty-seven thousand, nine hundred twenty-one".