774406664881 has 2 divisors, whose sum is σ = 774406664882. Its totient is φ = 774406664880.

The previous prime is 774406664833. The next prime is 774406664891. The reversal of 774406664881 is 188466604477.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770329203856 + 4077461025 = 877684^2 + 63855^2 .

It is a cyclic number.

It is not a de Polignac number, because 774406664881 - 2¹⁵ = 774406632113 is a prime.

It is a super-2 number, since 2×774406664881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (774406664891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387203332440 + 387203332441.

It is an arithmetic number, because the mean of its divisors is an integer number (387203332441).

Almost surely, 2^774406664881 is an apocalyptic number.

It is an amenable number.

774406664881 is a deficient number, since it is larger than the sum of its proper divisors (1).

774406664881 is an equidigital number, since it uses as much as digits as its factorization.

774406664881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43352064, while the sum is 61.

The spelling of 774406664881 in words is "seven hundred seventy-four billion, four hundred six million, six hundred sixty-four thousand, eight hundred eighty-one".