77758742251 has 2 divisors, whose sum is σ = 77758742252. Its totient is φ = 77758742250.

The previous prime is 77758742227. The next prime is 77758742329. The reversal of 77758742251 is 15224785777.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77758742251 - 2⁷ = 77758742123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77758742192 and 77758742201.

It is not a weakly prime, because it can be changed into another prime (77758772251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38879371125 + 38879371126.

It is an arithmetic number, because the mean of its divisors is an integer number (38879371126).

Almost surely, 2^77758742251 is an apocalyptic number.

77758742251 is a deficient number, since it is larger than the sum of its proper divisors (1).

77758742251 is an equidigital number, since it uses as much as digits as its factorization.

77758742251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7683200, while the sum is 55.

The spelling of 77758742251 in words is "seventy-seven billion, seven hundred fifty-eight million, seven hundred forty-two thousand, two hundred fifty-one".