3810870661681 has 2 divisors, whose sum is σ = 3810870661682. Its totient is φ = 3810870661680.

The previous prime is 3810870661649. The next prime is 3810870661693. The reversal of 3810870661681 is 1861660780183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2943008870400 + 867861791281 = 1715520^2 + 931591^2 .

It is an emirp because it is prime and its reverse (1861660780183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3810870661681 - 2⁵ = 3810870661649 is a prime.

It is a super-2 number, since 2×3810870661681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3810870661621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1905435330840 + 1905435330841.

It is an arithmetic number, because the mean of its divisors is an integer number (1905435330841).

Almost surely, 2^{3810870661681} is an apocalyptic number.

It is an amenable number.

3810870661681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3810870661681 is an equidigital number, since it uses as much as digits as its factorization.

3810870661681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 3810870661681 in words is "three trillion, eight hundred ten billion, eight hundred seventy million, six hundred sixty-one thousand, six hundred eighty-one".