764123191721 has 8 divisors (see below), whose sum is σ = 765833232384. Its totient is φ = 762414084640.

The previous prime is 764123191717. The next prime is 764123191723. The reversal of 764123191721 is 127191321467.

764123191721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 764123191721 - 2² = 764123191717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764123191723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1418456 + ... + 1881558.

It is an arithmetic number, because the mean of its divisors is an integer number (95729154048).

Almost surely, 2^764123191721 is an apocalyptic number.

It is an amenable number.

764123191721 is a deficient number, since it is larger than the sum of its proper divisors (1710040663).

764123191721 is a wasteful number, since it uses less digits than its factorization.

764123191721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466791.

The product of its digits is 127008, while the sum is 44.

The spelling of 764123191721 in words is "seven hundred sixty-four billion, one hundred twenty-three million, one hundred ninety-one thousand, seven hundred twenty-one".