7758668513 has 2 divisors, whose sum is σ = 7758668514. Its totient is φ = 7758668512.

The previous prime is 7758668503. The next prime is 7758668557. The reversal of 7758668513 is 3158668577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5395930849 + 2362737664 = 73457^2 + 48608^2 .

It is a cyclic number.

It is not a de Polignac number, because 7758668513 - 2⁸ = 7758668257 is a prime.

It is not a weakly prime, because it can be changed into another prime (7758668503) 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, 3879334256 + 3879334257.

It is an arithmetic number, because the mean of its divisors is an integer number (3879334257).

Almost surely, 2^7758668513 is an apocalyptic number.

It is an amenable number.

7758668513 is a deficient number, since it is larger than the sum of its proper divisors (1).

7758668513 is an equidigital number, since it uses as much as digits as its factorization.

7758668513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 56.

The square root of 7758668513 is about 88083.3043941927. The cubic root of 7758668513 is about 1979.6833586264.

The spelling of 7758668513 in words is "seven billion, seven hundred fifty-eight million, six hundred sixty-eight thousand, five hundred thirteen".