7777648663 has 2 divisors, whose sum is σ = 7777648664. Its totient is φ = 7777648662.

The previous prime is 7777648519. The next prime is 7777648687. The reversal of 7777648663 is 3668467777.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7777648663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7777648163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3888824331 + 3888824332.

It is an arithmetic number, because the mean of its divisors is an integer number (3888824332).

Almost surely, 2^7777648663 is an apocalyptic number.

7777648663 is a deficient number, since it is larger than the sum of its proper divisors (1).

7777648663 is an equidigital number, since it uses as much as digits as its factorization.

7777648663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49787136, while the sum is 61.

The square root of 7777648663 is about 88190.9783537976. The cubic root of 7777648663 is about 1981.2963539819.

The spelling of 7777648663 in words is "seven billion, seven hundred seventy-seven million, six hundred forty-eight thousand, six hundred sixty-three".