3820855681 has 2 divisors, whose sum is σ = 3820855682. Its totient is φ = 3820855680.

The previous prime is 3820855669. The next prime is 3820855691. The reversal of 3820855681 is 1865580283.

3820855681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2306400625 + 1514455056 = 48025^2 + 38916^2 .

It is a cyclic number.

It is not a de Polignac number, because 3820855681 - 2²⁵ = 3787301249 is a prime.

It is a super-2 number, since 2×3820855681² = 29197876270059947522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3820855691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910427840 + 1910427841.

It is an arithmetic number, because the mean of its divisors is an integer number (1910427841).

Almost surely, 2^3820855681 is an apocalyptic number.

It is an amenable number.

3820855681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3820855681 is an equidigital number, since it uses as much as digits as its factorization.

3820855681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 46.

The square root of 3820855681 is about 61813.0704705728. The cubic root of 3820855681 is about 1563.3403769088.

The spelling of 3820855681 in words is "three billion, eight hundred twenty million, eight hundred fifty-five thousand, six hundred eighty-one".