8778479657 has 2 divisors, whose sum is σ = 8778479658. Its totient is φ = 8778479656.

The previous prime is 8778479603. The next prime is 8778479681. The reversal of 8778479657 is 7569748778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8596256656 + 182223001 = 92716^2 + 13499^2 .

It is a cyclic number.

It is not a de Polignac number, because 8778479657 - 2¹⁴ = 8778463273 is a prime.

It is not a weakly prime, because it can be changed into another prime (8778472657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4389239828 + 4389239829.

It is an arithmetic number, because the mean of its divisors is an integer number (4389239829).

Almost surely, 2^8778479657 is an apocalyptic number.

It is an amenable number.

8778479657 is a deficient number, since it is larger than the sum of its proper divisors (1).

8778479657 is an equidigital number, since it uses as much as digits as its factorization.

8778479657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165957120, while the sum is 68.

The square root of 8778479657 is about 93693.5411701362. The cubic root of 8778479657 is about 2062.8759009357.

The spelling of 8778479657 in words is "eight billion, seven hundred seventy-eight million, four hundred seventy-nine thousand, six hundred fifty-seven".