3853521665761 has 2 divisors, whose sum is σ = 3853521665762. Its totient is φ = 3853521665760.

The previous prime is 3853521665743. The next prime is 3853521665783. The reversal of 3853521665761 is 1675661253583.

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., 2107595483536 + 1745926182225 = 1451756^2 + 1321335^2 .

It is a cyclic number.

It is not a de Polignac number, because 3853521665761 - 2⁷ = 3853521665633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3853521665696 and 3853521665705.

It is not a weakly prime, because it can be changed into another prime (3853521669761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1926760832880 + 1926760832881.

It is an arithmetic number, because the mean of its divisors is an integer number (1926760832881).

Almost surely, 2^{3853521665761} is an apocalyptic number.

It is an amenable number.

3853521665761 is a deficient number, since it is larger than the sum of its proper divisors (1).

3853521665761 is an equidigital number, since it uses as much as digits as its factorization.

3853521665761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 58.

The spelling of 3853521665761 in words is "three trillion, eight hundred fifty-three billion, five hundred twenty-one million, six hundred sixty-five thousand, seven hundred sixty-one".