2206744778677 has 2 divisors, whose sum is σ = 2206744778678. Its totient is φ = 2206744778676.

The previous prime is 2206744778597. The next prime is 2206744778687. The reversal of 2206744778677 is 7768774476022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2200715877361 + 6028901316 = 1483481^2 + 77646^2 .

It is a cyclic number.

It is not a de Polignac number, because 2206744778677 - 2²³ = 2206736390069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2206744778687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103372389338 + 1103372389339.

It is an arithmetic number, because the mean of its divisors is an integer number (1103372389339).

Almost surely, 2^{2206744778677} is an apocalyptic number.

It is an amenable number.

2206744778677 is a deficient number, since it is larger than the sum of its proper divisors (1).

2206744778677 is an equidigital number, since it uses as much as digits as its factorization.

2206744778677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 309786624, while the sum is 67.

The spelling of 2206744778677 in words is "two trillion, two hundred six billion, seven hundred forty-four million, seven hundred seventy-eight thousand, six hundred seventy-seven".