4085297377781 has 2 divisors, whose sum is σ = 4085297377782. Its totient is φ = 4085297377780.

The previous prime is 4085297377757. The next prime is 4085297377823. The reversal of 4085297377781 is 1877737925804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2471404084900 + 1613893292881 = 1572070^2 + 1270391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4085297377781 is a prime.

It is a super-2 number, since 2×4085297377781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4085297379781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042648688890 + 2042648688891.

It is an arithmetic number, because the mean of its divisors is an integer number (2042648688891).

Almost surely, 2^{4085297377781} is an apocalyptic number.

It is an amenable number.

4085297377781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085297377781 is an equidigital number, since it uses as much as digits as its factorization.

4085297377781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165957120, while the sum is 68.

The spelling of 4085297377781 in words is "four trillion, eighty-five billion, two hundred ninety-seven million, three hundred seventy-seven thousand, seven hundred eighty-one".