77854769413 has 2 divisors, whose sum is σ = 77854769414. Its totient is φ = 77854769412.

The previous prime is 77854769339. The next prime is 77854769429. The reversal of 77854769413 is 31496745877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58361862724 + 19492906689 = 241582^2 + 139617^2 .

It is a cyclic number.

It is not a de Polignac number, because 77854769413 - 2¹⁷ = 77854638341 is a prime.

It is a super-2 number, since 2×77854769413² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77854769453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38927384706 + 38927384707.

It is an arithmetic number, because the mean of its divisors is an integer number (38927384707).

Almost surely, 2^77854769413 is an apocalyptic number.

It is an amenable number.

77854769413 is a deficient number, since it is larger than the sum of its proper divisors (1).

77854769413 is an equidigital number, since it uses as much as digits as its factorization.

77854769413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35562240, while the sum is 61.

The spelling of 77854769413 in words is "seventy-seven billion, eight hundred fifty-four million, seven hundred sixty-nine thousand, four hundred thirteen".