8778755962261 has 2 divisors, whose sum is σ = 8778755962262. Its totient is φ = 8778755962260.

The previous prime is 8778755962259. The next prime is 8778755962337. The reversal of 8778755962261 is 1622695578778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7625849112036 + 1152906850225 = 2761494^2 + 1073735^2 .

It is a cyclic number.

It is not a de Polignac number, because 8778755962261 - 2¹ = 8778755962259 is a prime.

Together with 8778755962259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8778755362261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4389377981130 + 4389377981131.

It is an arithmetic number, because the mean of its divisors is an integer number (4389377981131).

Almost surely, 2^{8778755962261} is an apocalyptic number.

It is an amenable number.

8778755962261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8778755962261 is an equidigital number, since it uses as much as digits as its factorization.

8778755962261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 711244800, while the sum is 73.

The spelling of 8778755962261 in words is "eight trillion, seven hundred seventy-eight billion, seven hundred fifty-five million, nine hundred sixty-two thousand, two hundred sixty-one".