3781285066331 has 2 divisors, whose sum is σ = 3781285066332. Its totient is φ = 3781285066330.

The previous prime is 3781285066183. The next prime is 3781285066333. The reversal of 3781285066331 is 1336605821873.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781285066331 is a prime.

It is a super-2 number, since 2×3781285066331² (a number of 26 digits) contains 22 as substring.

Together with 3781285066333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3781285066333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890642533165 + 1890642533166.

It is an arithmetic number, because the mean of its divisors is an integer number (1890642533166).

Almost surely, 2^{3781285066331} is an apocalyptic number.

3781285066331 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781285066331 is an equidigital number, since it uses as much as digits as its factorization.

3781285066331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 3781285066331 in words is "three trillion, seven hundred eighty-one billion, two hundred eighty-five million, sixty-six thousand, three hundred thirty-one".