77694080257 has 2 divisors, whose sum is σ = 77694080258. Its totient is φ = 77694080256.

The previous prime is 77694080251. The next prime is 77694080273. The reversal of 77694080257 is 75208049677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68060461456 + 9633618801 = 260884^2 + 98151^2 .

It is an emirp because it is prime and its reverse (75208049677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77694080257 - 2²³ = 77685691649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77694080198 and 77694080207.

It is not a weakly prime, because it can be changed into another prime (77694080251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38847040128 + 38847040129.

It is an arithmetic number, because the mean of its divisors is an integer number (38847040129).

Almost surely, 2^77694080257 is an apocalyptic number.

It is an amenable number.

77694080257 is a deficient number, since it is larger than the sum of its proper divisors (1).

77694080257 is an equidigital number, since it uses as much as digits as its factorization.

77694080257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 77694080257 in words is "seventy-seven billion, six hundred ninety-four million, eighty thousand, two hundred fifty-seven".