776433638413 has 2 divisors, whose sum is σ = 776433638414. Its totient is φ = 776433638412.

The previous prime is 776433638411. The next prime is 776433638419. The reversal of 776433638413 is 314836334677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511721330409 + 264712308004 = 715347^2 + 514502^2 .

It is a cyclic number.

It is not a de Polignac number, because 776433638413 - 2¹ = 776433638411 is a prime.

Together with 776433638411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (776433638411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388216819206 + 388216819207.

It is an arithmetic number, because the mean of its divisors is an integer number (388216819207).

Almost surely, 2^776433638413 is an apocalyptic number.

It is an amenable number.

776433638413 is a deficient number, since it is larger than the sum of its proper divisors (1).

776433638413 is an equidigital number, since it uses as much as digits as its factorization.

776433638413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 55.

The spelling of 776433638413 in words is "seven hundred seventy-six billion, four hundred thirty-three million, six hundred thirty-eight thousand, four hundred thirteen".