77699359813 has 2 divisors, whose sum is σ = 77699359814. Its totient is φ = 77699359812.

The previous prime is 77699359769. The next prime is 77699359819. The reversal of 77699359813 is 31895399677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62884088289 + 14815271524 = 250767^2 + 121718^2 .

It is a cyclic number.

It is not a de Polignac number, because 77699359813 - 2²¹ = 77697262661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77699359819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38849679906 + 38849679907.

It is an arithmetic number, because the mean of its divisors is an integer number (38849679907).

Almost surely, 2^77699359813 is an apocalyptic number.

It is an amenable number.

77699359813 is a deficient number, since it is larger than the sum of its proper divisors (1).

77699359813 is an equidigital number, since it uses as much as digits as its factorization.

77699359813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77157360, while the sum is 67.

The spelling of 77699359813 in words is "seventy-seven billion, six hundred ninety-nine million, three hundred fifty-nine thousand, eight hundred thirteen".