3806778555257 has 2 divisors, whose sum is σ = 3806778555258. Its totient is φ = 3806778555256.

The previous prime is 3806778555233. The next prime is 3806778555301. The reversal of 3806778555257 is 7525558776083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2651592113641 + 1155186441616 = 1628371^2 + 1074796^2 .

It is a cyclic number.

It is not a de Polignac number, because 3806778555257 - 2¹⁴ = 3806778538873 is a prime.

It is not a weakly prime, because it can be changed into another prime (3806778555757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1903389277628 + 1903389277629.

It is an arithmetic number, because the mean of its divisors is an integer number (1903389277629).

Almost surely, 2^{3806778555257} is an apocalyptic number.

It is an amenable number.

3806778555257 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806778555257 is an equidigital number, since it uses as much as digits as its factorization.

3806778555257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920000, while the sum is 68.

The spelling of 3806778555257 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, five hundred fifty-five thousand, two hundred fifty-seven".