774406664821 has 16 divisors (see below), whose sum is σ = 796344192000. Its totient is φ = 752843203200.

The previous prime is 774406664777. The next prime is 774406664833. The reversal of 774406664821 is 128466604477.

It is a cyclic number.

It is not a de Polignac number, because 774406664821 - 2⁷ = 774406664693 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 (774406664881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1408680 + ... + 1879678.

It is an arithmetic number, because the mean of its divisors is an integer number (49771512000).

Almost surely, 2^774406664821 is an apocalyptic number.

It is an amenable number.

774406664821 is a deficient number, since it is larger than the sum of its proper divisors (21937527179).

774406664821 is a wasteful number, since it uses less digits than its factorization.

774406664821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471396.

The product of its (nonzero) digits is 10838016, while the sum is 55.

The spelling of 774406664821 in words is "seven hundred seventy-four billion, four hundred six million, six hundred sixty-four thousand, eight hundred twenty-one".