774661509493 has 2 divisors, whose sum is σ = 774661509494. Its totient is φ = 774661509492.

The previous prime is 774661509469. The next prime is 774661509527. The reversal of 774661509493 is 394905166477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422321918769 + 352339590724 = 649863^2 + 593582^2 .

It is a cyclic number.

It is not a de Polignac number, because 774661509493 - 2⁹ = 774661508981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774661509593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387330754746 + 387330754747.

It is an arithmetic number, because the mean of its divisors is an integer number (387330754747).

Almost surely, 2^774661509493 is an apocalyptic number.

It is an amenable number.

774661509493 is a deficient number, since it is larger than the sum of its proper divisors (1).

774661509493 is an equidigital number, since it uses as much as digits as its factorization.

774661509493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 774661509493 in words is "seven hundred seventy-four billion, six hundred sixty-one million, five hundred nine thousand, four hundred ninety-three".