768176121721 has 4 divisors (see below), whose sum is σ = 768908416500. Its totient is φ = 767443826944.

The previous prime is 768176121703. The next prime is 768176121793. The reversal of 768176121721 is 127121671867.

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

It can be written as a sum of positive squares in 2 ways, for example, as 743369871721 + 24806250000 = 862189^2 + 157500^2 .

It is a cyclic number.

It is not a de Polignac number, because 768176121721 - 2⁵ = 768176121689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768176121421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366145816 + ... + 366147913.

It is an arithmetic number, because the mean of its divisors is an integer number (192227104125).

Almost surely, 2^768176121721 is an apocalyptic number.

It is an amenable number.

768176121721 is a deficient number, since it is larger than the sum of its proper divisors (732294779).

768176121721 is a wasteful number, since it uses less digits than its factorization.

768176121721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732294778.

The product of its digits is 395136, while the sum is 49.

The spelling of 768176121721 in words is "seven hundred sixty-eight billion, one hundred seventy-six million, one hundred twenty-one thousand, seven hundred twenty-one".