774987927221 has 2 divisors, whose sum is σ = 774987927222. Its totient is φ = 774987927220.

The previous prime is 774987927179. The next prime is 774987927283. The reversal of 774987927221 is 122729789477.

774987927221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 705482404900 + 69505522321 = 839930^2 + 263639^2 .

It is a cyclic number.

It is not a de Polignac number, because 774987927221 - 2⁶ = 774987927157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774987927121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387493963610 + 387493963611.

It is an arithmetic number, because the mean of its divisors is an integer number (387493963611).

Almost surely, 2^774987927221 is an apocalyptic number.

It is an amenable number.

774987927221 is a deficient number, since it is larger than the sum of its proper divisors (1).

774987927221 is an equidigital number, since it uses as much as digits as its factorization.

774987927221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49787136, while the sum is 65.

The spelling of 774987927221 in words is "seven hundred seventy-four billion, nine hundred eighty-seven million, nine hundred twenty-seven thousand, two hundred twenty-one".